Commit 644ea2dde9

Andrew Kelley <superjoe30@gmail.com>
2017-05-03 23:23:11
remove test and try expressions in favor of if expressions
See #357
1 parent 0940d46
doc/langref.md
@@ -91,9 +91,9 @@ Defer(body) = option("%") "defer" body
 
 IfExpression(body) = "if" "(" Expression ")" body option("else" BlockExpression(body))
 
-TryExpression(body) = "try" "(" Expression ")" option("|" option("*") Symbol "|") body option("else" option("|" Symbol "|") BlockExpression(body))
+TryExpression(body) = "if" "(" Expression ")" option("|" option("*") Symbol "|") body "else" "|" Symbol "|" BlockExpression(body)
 
-TestExpression(body) = "test" "(" Expression ")" option("|" option("*") Symbol "|") body option("else" option("|" Symbol "|") BlockExpression(body))
+TestExpression(body) = "if" "(" Expression ")" option("|" option("*") Symbol "|") body option("else" BlockExpression(body))
 
 BoolAndExpression = ComparisonExpression "and" BoolAndExpression | ComparisonExpression
 
src/ast_render.cpp
@@ -763,7 +763,7 @@ static void render_node_extra(AstRender *ar, AstNode *node, bool grouped) {
             }
         case NodeTypeTryExpr:
             {
-                fprintf(ar->f, "try (");
+                fprintf(ar->f, "if (");
                 render_node_grouped(ar, node->data.try_expr.target_node);
                 fprintf(ar->f, ") ");
                 if (node->data.try_expr.var_symbol) {
@@ -783,7 +783,7 @@ static void render_node_extra(AstRender *ar, AstNode *node, bool grouped) {
             }
         case NodeTypeTestExpr:
             {
-                fprintf(ar->f, "test (");
+                fprintf(ar->f, "if (");
                 render_node_grouped(ar, node->data.test_expr.target_node);
                 fprintf(ar->f, ") ");
                 if (node->data.test_expr.var_symbol) {
src/parser.cpp
@@ -215,7 +215,7 @@ static AstNode *ast_parse_block_or_expression(ParseContext *pc, size_t *token_in
 static AstNode *ast_parse_block_expr_or_expression(ParseContext *pc, size_t *token_index, bool mandatory);
 static AstNode *ast_parse_expression(ParseContext *pc, size_t *token_index, bool mandatory);
 static AstNode *ast_parse_block(ParseContext *pc, size_t *token_index, bool mandatory);
-static AstNode *ast_parse_if_expr(ParseContext *pc, size_t *token_index, bool mandatory);
+static AstNode *ast_parse_if_try_test_expr(ParseContext *pc, size_t *token_index, bool mandatory);
 static AstNode *ast_parse_block_expr(ParseContext *pc, size_t *token_index, bool mandatory);
 static AstNode *ast_parse_unwrap_expr(ParseContext *pc, size_t *token_index, bool mandatory);
 static AstNode *ast_parse_prefix_op_expr(ParseContext *pc, size_t *token_index, bool mandatory);
@@ -639,110 +639,6 @@ static AstNode *ast_parse_comptime_expr(ParseContext *pc, size_t *token_index, b
     return node;
 }
 
-/*
-TryExpression(body) = "try" "(" Expression ")" option("|" option("*") Symbol "|") body option("else" option("|" Symbol "|") BlockExpression(body))
-*/
-static AstNode *ast_parse_try_expr(ParseContext *pc, size_t *token_index, bool mandatory) {
-    Token *try_token = &pc->tokens->at(*token_index);
-    if (try_token->id == TokenIdKeywordTry) {
-        *token_index += 1;
-    } else if (mandatory) {
-        ast_expect_token(pc, try_token, TokenIdKeywordTry);
-        zig_unreachable();
-    } else {
-        return nullptr;
-    }
-
-    AstNode *node = ast_create_node(pc, NodeTypeTryExpr, try_token);
-
-    ast_eat_token(pc, token_index, TokenIdLParen);
-    node->data.try_expr.target_node = ast_parse_expression(pc, token_index, true);
-    ast_eat_token(pc, token_index, TokenIdRParen);
-
-    Token *open_bar_tok = &pc->tokens->at(*token_index);
-    if (open_bar_tok->id == TokenIdBinOr) {
-        *token_index += 1;
-
-        Token *star_tok = &pc->tokens->at(*token_index);
-        if (star_tok->id == TokenIdStar) {
-            *token_index += 1;
-            node->data.try_expr.var_is_ptr = true;
-        }
-
-        Token *var_name_tok = ast_eat_token(pc, token_index, TokenIdSymbol);
-        node->data.try_expr.var_symbol = token_buf(var_name_tok);
-
-        ast_eat_token(pc, token_index, TokenIdBinOr);
-    }
-
-    node->data.try_expr.then_node = ast_parse_block_or_expression(pc, token_index, true);
-
-    Token *else_token = &pc->tokens->at(*token_index);
-    if (else_token->id == TokenIdKeywordElse) {
-        *token_index += 1;
-        Token *open_bar_tok = &pc->tokens->at(*token_index);
-        if (open_bar_tok->id == TokenIdBinOr) {
-            *token_index += 1;
-
-            Token *err_name_tok = ast_eat_token(pc, token_index, TokenIdSymbol);
-            node->data.try_expr.err_symbol = token_buf(err_name_tok);
-
-            ast_eat_token(pc, token_index, TokenIdBinOr);
-        }
-
-        node->data.try_expr.else_node = ast_parse_block_expr_or_expression(pc, token_index, true);
-    }
-
-    return node;
-}
-
-/*
-TestExpression(body) = "test" "(" Expression ")" option("|" option("*") Symbol "|") body option("else" BlockExpression(body))
-*/
-static AstNode *ast_parse_test_expr(ParseContext *pc, size_t *token_index, bool mandatory) {
-    Token *test_token = &pc->tokens->at(*token_index);
-    if (test_token->id == TokenIdKeywordTest) {
-        *token_index += 1;
-    } else if (mandatory) {
-        ast_expect_token(pc, test_token, TokenIdKeywordTest);
-        zig_unreachable();
-    } else {
-        return nullptr;
-    }
-
-    AstNode *node = ast_create_node(pc, NodeTypeTestExpr, test_token);
-
-    ast_eat_token(pc, token_index, TokenIdLParen);
-    node->data.test_expr.target_node = ast_parse_expression(pc, token_index, true);
-    ast_eat_token(pc, token_index, TokenIdRParen);
-
-    Token *open_bar_tok = &pc->tokens->at(*token_index);
-    if (open_bar_tok->id == TokenIdBinOr) {
-        *token_index += 1;
-
-        Token *star_tok = &pc->tokens->at(*token_index);
-        if (star_tok->id == TokenIdStar) {
-            *token_index += 1;
-            node->data.test_expr.var_is_ptr = true;
-        }
-
-        Token *var_name_tok = ast_eat_token(pc, token_index, TokenIdSymbol);
-        node->data.test_expr.var_symbol = token_buf(var_name_tok);
-
-        ast_eat_token(pc, token_index, TokenIdBinOr);
-    }
-
-    node->data.test_expr.then_node = ast_parse_block_or_expression(pc, token_index, true);
-
-    Token *else_token = &pc->tokens->at(*token_index);
-    if (else_token->id == TokenIdKeywordElse) {
-        *token_index += 1;
-        node->data.test_expr.else_node = ast_parse_block_expr_or_expression(pc, token_index, true);
-    }
-
-    return node;
-}
-
 /*
 PrimaryExpression = Number | String | CharLiteral | KeywordLiteral | GroupedExpression | GotoExpression | BlockExpression(BlockOrExpression) | Symbol | ("@" Symbol FnCallExpression) | ArrayType | (option("extern") FnProto) | AsmExpression | ("error" "." Symbol) | ContainerDecl
 KeywordLiteral = "true" | "false" | "null" | "break" | "continue" | "undefined" | "error" | "this" | "unreachable"
@@ -1434,8 +1330,10 @@ static AstNode *ast_parse_bool_and_expr(ParseContext *pc, size_t *token_index, b
 
 /*
 IfExpression(body) = "if" "(" Expression ")" body option("else" BlockExpression(body))
+TryExpression(body) = "if" "(" Expression ")" option("|" option("*") Symbol "|") body "else" "|" Symbol "|" BlockExpression(body)
+TestExpression(body) = "if" "(" Expression ")" "|" option("*") Symbol "|" body option("else" BlockExpression(body))
 */
-static AstNode *ast_parse_if_expr(ParseContext *pc, size_t *token_index, bool mandatory) {
+static AstNode *ast_parse_if_try_test_expr(ParseContext *pc, size_t *token_index, bool mandatory) {
     Token *if_token = &pc->tokens->at(*token_index);
 
     if (if_token->id == TokenIdKeywordIf) {
@@ -1448,19 +1346,72 @@ static AstNode *ast_parse_if_expr(ParseContext *pc, size_t *token_index, bool ma
     }
 
     ast_eat_token(pc, token_index, TokenIdLParen);
-
-    AstNode *node = ast_create_node(pc, NodeTypeIfBoolExpr, if_token);
-    node->data.if_bool_expr.condition = ast_parse_expression(pc, token_index, true);
+    AstNode *condition = ast_parse_expression(pc, token_index, true);
     ast_eat_token(pc, token_index, TokenIdRParen);
-    node->data.if_bool_expr.then_block = ast_parse_block_or_expression(pc, token_index, true);
 
-    Token *else_token = &pc->tokens->at(*token_index);
-    if (else_token->id == TokenIdKeywordElse) {
+    Token *open_bar_tok = &pc->tokens->at(*token_index);
+    Token *var_name_tok = nullptr;
+    bool var_is_ptr = false;
+    if (open_bar_tok->id == TokenIdBinOr) {
+        *token_index += 1;
+
+        Token *star_tok = &pc->tokens->at(*token_index);
+        if (star_tok->id == TokenIdStar) {
+            *token_index += 1;
+            var_is_ptr = true;
+        }
+
+        var_name_tok = ast_eat_token(pc, token_index, TokenIdSymbol);
+
+        ast_eat_token(pc, token_index, TokenIdBinOr);
+    }
+
+    AstNode *body_node = ast_parse_block_or_expression(pc, token_index, true);
+
+    Token *else_tok = &pc->tokens->at(*token_index);
+    AstNode *else_node = nullptr;
+    Token *err_name_tok = nullptr;
+    if (else_tok->id == TokenIdKeywordElse) {
         *token_index += 1;
-        node->data.if_bool_expr.else_node = ast_parse_block_expr_or_expression(pc, token_index, true);
+
+        Token *else_bar_tok = &pc->tokens->at(*token_index);
+        if (else_bar_tok->id == TokenIdBinOr) {
+            *token_index += 1;
+
+            err_name_tok = ast_eat_token(pc, token_index, TokenIdSymbol);
+
+            ast_eat_token(pc, token_index, TokenIdBinOr);
+        }
+
+        else_node = ast_parse_block_expr_or_expression(pc, token_index, true);
     }
 
-    return node;
+    if (err_name_tok != nullptr) {
+        AstNode *node = ast_create_node(pc, NodeTypeTryExpr, if_token);
+        node->data.try_expr.target_node = condition;
+        node->data.try_expr.var_is_ptr = var_is_ptr;
+        if (var_name_tok != nullptr) {
+            node->data.try_expr.var_symbol = token_buf(var_name_tok);
+        }
+        node->data.try_expr.then_node = body_node;
+        node->data.try_expr.err_symbol = token_buf(err_name_tok);
+        node->data.try_expr.else_node = else_node;
+        return node;
+    } else if (var_name_tok != nullptr) {
+        AstNode *node = ast_create_node(pc, NodeTypeTestExpr, if_token);
+        node->data.test_expr.target_node = condition;
+        node->data.test_expr.var_is_ptr = var_is_ptr;
+        node->data.test_expr.var_symbol = token_buf(var_name_tok);
+        node->data.test_expr.then_node = body_node;
+        node->data.test_expr.else_node = else_node;
+        return node;
+    } else {
+        AstNode *node = ast_create_node(pc, NodeTypeIfBoolExpr, if_token);
+        node->data.if_bool_expr.condition = condition;
+        node->data.if_bool_expr.then_block = body_node;
+        node->data.if_bool_expr.else_node = else_node;
+        return node;
+    }
 }
 
 /*
@@ -1848,7 +1799,7 @@ BlockExpression(body) = Block | IfExpression(body) | TryExpression(body) | TestE
 static AstNode *ast_parse_block_expr(ParseContext *pc, size_t *token_index, bool mandatory) {
     Token *token = &pc->tokens->at(*token_index);
 
-    AstNode *if_expr = ast_parse_if_expr(pc, token_index, false);
+    AstNode *if_expr = ast_parse_if_try_test_expr(pc, token_index, false);
     if (if_expr)
         return if_expr;
 
@@ -1872,14 +1823,6 @@ static AstNode *ast_parse_block_expr(ParseContext *pc, size_t *token_index, bool
     if (comptime_node)
         return comptime_node;
 
-    AstNode *try_node = ast_parse_try_expr(pc, token_index, false);
-    if (try_node)
-        return try_node;
-
-    AstNode *test_node = ast_parse_test_expr(pc, token_index, false);
-    if (test_node)
-        return test_node;
-
     if (mandatory)
         ast_invalid_token_error(pc, token);
 
src/tokenizer.cpp
@@ -138,7 +138,6 @@ static const struct ZigKeyword zig_keywords[] = {
     {"test", TokenIdKeywordTest},
     {"this", TokenIdKeywordThis},
     {"true", TokenIdKeywordTrue},
-    {"try", TokenIdKeywordTry},
     {"undefined", TokenIdKeywordUndefined},
     {"union", TokenIdKeywordUnion},
     {"unreachable", TokenIdKeywordUnreachable},
@@ -1472,7 +1471,6 @@ const char * token_name(TokenId id) {
         case TokenIdKeywordTest: return "test";
         case TokenIdKeywordThis: return "this";
         case TokenIdKeywordTrue: return "true";
-        case TokenIdKeywordTry: return "try";
         case TokenIdKeywordUndefined: return "undefined";
         case TokenIdKeywordUnion: return "union";
         case TokenIdKeywordUnreachable: return "unreachable";
src/tokenizer.hpp
@@ -75,7 +75,6 @@ enum TokenId {
     TokenIdKeywordTest,
     TokenIdKeywordThis,
     TokenIdKeywordTrue,
-    TokenIdKeywordTry,
     TokenIdKeywordUndefined,
     TokenIdKeywordUnion,
     TokenIdKeywordUnreachable,
std/os/child_process.zig
@@ -59,9 +59,9 @@ pub const ChildProcess = struct {
                     errno.EINVAL, errno.ECHILD => unreachable,
                     errno.EINTR => continue,
                     else => {
-                        test (self.stdin) |*stdin| { stdin.close(); }
-                        test (self.stdout) |*stdout| { stdout.close(); }
-                        test (self.stderr) |*stderr| { stderr.close(); }
+                        if (self.stdin) |*stdin| { stdin.close(); }
+                        if (self.stdout) |*stdout| { stdout.close(); }
+                        if (self.stderr) |*stderr| { stderr.close(); }
                         return error.Unexpected;
                     },
                 }
@@ -69,9 +69,9 @@ pub const ChildProcess = struct {
             break;
         }
 
-        test (self.stdin) |*stdin| { stdin.close(); }
-        test (self.stdout) |*stdout| { stdout.close(); }
-        test (self.stderr) |*stderr| { stderr.close(); }
+        if (self.stdin) |*stdin| { stdin.close(); }
+        if (self.stdout) |*stdout| { stdout.close(); }
+        if (self.stderr) |*stderr| { stderr.close(); }
 
         // Write @maxValue(ErrInt) to the write end of the err_pipe. This is after
         // waitpid, so this write is guaranteed to be after the child
@@ -143,7 +143,7 @@ pub const ChildProcess = struct {
             setUpChildIo(stderr, stderr_pipe[1], posix.STDERR_FILENO, dev_null_fd) %%
                 |err| forkChildErrReport(err_pipe[1], err);
 
-            test (maybe_cwd) |cwd| {
+            if (maybe_cwd) |cwd| {
                 os.changeCurDir(allocator, cwd) %%
                     |err| forkChildErrReport(err_pipe[1], err);
             }
std/os/index.zig
@@ -173,7 +173,7 @@ pub fn posixOpen(file_path: []const u8, flags: usize, perm: usize, allocator: ?&
 
     if (file_path.len < stack_buf.len) {
         path0 = stack_buf[0...file_path.len + 1];
-    } else test (allocator) |a| {
+    } else if (allocator) |a| {
         path0 = %return a.alloc(u8, file_path.len + 1);
         need_free = true;
     } else {
@@ -241,7 +241,7 @@ pub fn posixExecve(exe_path: []const u8, argv: []const []const u8, env_map: &con
     mem.set(?&u8, argv_buf, null);
     defer {
         for (argv_buf) |arg| {
-            const arg_buf = test (arg) |ptr| cstr.toSlice(ptr) else break;
+            const arg_buf = if (arg) |ptr| cstr.toSlice(ptr) else break;
             allocator.free(arg_buf);
         }
         allocator.free(argv_buf);
@@ -268,7 +268,7 @@ pub fn posixExecve(exe_path: []const u8, argv: []const []const u8, env_map: &con
     mem.set(?&u8, envp_buf, null);
     defer {
         for (envp_buf) |env| {
-            const env_buf = test (env) |ptr| cstr.toSlice(ptr) else break;
+            const env_buf = if (env) |ptr| cstr.toSlice(ptr) else break;
             allocator.free(env_buf);
         }
         allocator.free(envp_buf);
@@ -448,7 +448,7 @@ pub fn symLink(allocator: &Allocator, existing_path: []const u8, new_path: []con
 const b64_fs_alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_=";
 
 pub fn atomicSymLink(allocator: &Allocator, existing_path: []const u8, new_path: []const u8) -> %void {
-    try (symLink(allocator, existing_path, new_path)) {
+    if (symLink(allocator, existing_path, new_path)) {
         return;
     } else |err| {
         if (err != error.PathAlreadyExists) {
@@ -463,7 +463,7 @@ pub fn atomicSymLink(allocator: &Allocator, existing_path: []const u8, new_path:
     while (true) {
         %return getRandomBytes(rand_buf[0...]);
         _ = base64.encodeWithAlphabet(tmp_path[new_path.len...], rand_buf, b64_fs_alphabet);
-        try (symLink(allocator, existing_path, tmp_path)) {
+        if (symLink(allocator, existing_path, tmp_path)) {
             return rename(allocator, tmp_path, new_path);
         } else |err| {
             if (err == error.PathAlreadyExists) {
@@ -668,7 +668,7 @@ pub fn deleteDir(allocator: &Allocator, dir_path: []const u8) -> %void {
 pub fn deleteTree(allocator: &Allocator, full_path: []const u8) -> %void {
 start_over:
     // First, try deleting the item as a file. This way we don't follow sym links.
-    try (deleteFile(allocator, full_path)) {
+    if (deleteFile(allocator, full_path)) {
         return;
     } else |err| {
         if (err == error.FileNotFound)
std/os/path.zig
@@ -243,7 +243,7 @@ pub fn relative(allocator: &Allocator, from: []const u8, to: []const u8) -> %[]u
     while (true) {
         const from_component = from_it.next() ?? return mem.dupe(allocator, u8, to_it.rest());
         const to_rest = to_it.rest();
-        test(to_it.next()) |to_component| {
+        if (to_it.next()) |to_component| {
             if (mem.eql(u8, from_component, to_component))
                 continue;
         }
std/special/build_runner.zig
@@ -63,7 +63,7 @@ pub fn main() -> %void {
                 %%io.stderr.printf("Expected option name after '-D'\n\n");
                 return usage(&builder, false, &io.stderr);
             }
-            test (mem.indexOfScalar(u8, option_contents, '=')) |name_end| {
+            if (mem.indexOfScalar(u8, option_contents, '=')) |name_end| {
                 const option_name = option_contents[0...name_end];
                 const option_value = option_contents[name_end + 1...];
                 if (builder.addUserInputOption(option_name, option_value))
std/special/compiler_rt.zig
@@ -36,7 +36,7 @@ export fn __udivmoddi4(a: du_int, b: du_int, maybe_rem: ?&du_int) -> du_int {
             // 0 X
             // ---
             // 0 X
-            test (maybe_rem) |rem| {
+            if (maybe_rem) |rem| {
                 *rem = n[low] % d[low];
             }
             return n[low] / d[low];
@@ -44,7 +44,7 @@ export fn __udivmoddi4(a: du_int, b: du_int, maybe_rem: ?&du_int) -> du_int {
         // 0 X
         // ---
         // K X
-        test (maybe_rem) |rem| {
+        if (maybe_rem) |rem| {
             *rem = n[low];
         }
         return 0;
@@ -55,7 +55,7 @@ export fn __udivmoddi4(a: du_int, b: du_int, maybe_rem: ?&du_int) -> du_int {
             // K X
             // ---
             // 0 0
-            test (maybe_rem) |rem| {
+            if (maybe_rem) |rem| {
                 *rem = n[high] % d[low];
             }
             return n[high] / d[low];
@@ -65,7 +65,7 @@ export fn __udivmoddi4(a: du_int, b: du_int, maybe_rem: ?&du_int) -> du_int {
             // K 0
             // ---
             // K 0
-            test (maybe_rem) |rem| {
+            if (maybe_rem) |rem| {
                 r[high] = n[high] % d[high];
                 r[low] = 0;
                 *rem = *@ptrCast(&du_int, &r[0]);
@@ -77,7 +77,7 @@ export fn __udivmoddi4(a: du_int, b: du_int, maybe_rem: ?&du_int) -> du_int {
         // K 0
         // if d is a power of 2
         if ((d[high] & (d[high] - 1)) == 0) {
-            test (maybe_rem) |rem| {
+            if (maybe_rem) |rem| {
                 r[low] = n[low];
                 r[high] = n[high] & (d[high] - 1);
                 *rem = *@ptrCast(&du_int, &r[0]);
@@ -90,7 +90,7 @@ export fn __udivmoddi4(a: du_int, b: du_int, maybe_rem: ?&du_int) -> du_int {
         sr = @clz(su_int(d[high])) - @clz(su_int(n[high]));
         // 0 <= sr <= n_uword_bits - 2 or sr large
         if (sr > n_uword_bits - 2) {
-            test (maybe_rem) |rem| {
+            if (maybe_rem) |rem| {
                 *rem = *@ptrCast(&du_int, &n[0]);
             }
             return 0;
@@ -111,7 +111,7 @@ export fn __udivmoddi4(a: du_int, b: du_int, maybe_rem: ?&du_int) -> du_int {
             // 0 K
             // if d is a power of 2
             if ((d[low] & (d[low] - 1)) == 0) {
-                test (maybe_rem) |rem| {
+                if (maybe_rem) |rem| {
                     *rem = n[low] & (d[low] - 1);
                 }
                 if (d[low] == 1) {
@@ -155,7 +155,7 @@ export fn __udivmoddi4(a: du_int, b: du_int, maybe_rem: ?&du_int) -> du_int {
             sr = @clz(su_int(d[high])) - @clz(su_int(n[high]));
             // 0 <= sr <= n_uword_bits - 1 or sr large
             if (sr > n_uword_bits - 1) {
-                test (maybe_rem) |rem| {
+                if (maybe_rem) |rem| {
                     *rem = *@ptrCast(&du_int, &n[0]);
                 }
                 return 0;
@@ -200,7 +200,7 @@ export fn __udivmoddi4(a: du_int, b: du_int, maybe_rem: ?&du_int) -> du_int {
         sr -= 1;
     }
     *@ptrCast(&du_int, &q[0]) = (*@ptrCast(&du_int, &q[0]) << 1) | u64(carry);
-    test (maybe_rem) |rem| {
+    if (maybe_rem) |rem| {
         *rem = *@ptrCast(&du_int, &r[0]);
     }
     return *@ptrCast(&du_int, &q[0]);
std/buf_map.zig
@@ -28,7 +28,7 @@ pub const BufMap = struct {
     }
 
     pub fn set(self: &BufMap, key: []const u8, value: []const u8) -> %void {
-        test (self.hash_map.get(key)) |entry| {
+        if (self.hash_map.get(key)) |entry| {
             const value_copy = %return self.copy(value);
             %defer self.free(value_copy);
             _ = %return self.hash_map.put(key, value_copy);
std/build.zig
@@ -306,7 +306,7 @@ pub const Builder = struct {
     }
 
     fn processNixOSEnvVars(self: &Builder) {
-        test (os.getEnv("NIX_CFLAGS_COMPILE")) |nix_cflags_compile| {
+        if (os.getEnv("NIX_CFLAGS_COMPILE")) |nix_cflags_compile| {
             var it = mem.split(nix_cflags_compile, ' ');
             while (true) {
                 const word = it.next() ?? break;
@@ -322,7 +322,7 @@ pub const Builder = struct {
                 }
             }
         }
-        test (os.getEnv("NIX_LDFLAGS")) |nix_ldflags| {
+        if (os.getEnv("NIX_LDFLAGS")) |nix_ldflags| {
             var it = mem.split(nix_ldflags, ' ');
             while (true) {
                 const word = it.next() ?? break;
@@ -350,7 +350,7 @@ pub const Builder = struct {
             .type_id = type_id,
             .description = description,
         };
-        test (%%self.available_options_map.put(name, available_option)) {
+        if (%%self.available_options_map.put(name, available_option) != null) {
             debug.panic("Option '{}' declared twice", name);
         }
         %%self.available_options_list.append(available_option);
@@ -424,7 +424,7 @@ pub const Builder = struct {
     }
 
     pub fn addUserInputOption(self: &Builder, name: []const u8, value: []const u8) -> bool {
-        test (%%self.user_input_options.put(name, UserInputOption {
+        if (%%self.user_input_options.put(name, UserInputOption {
             .name = name,
             .value = UserValue.Scalar { value },
             .used = false,
@@ -461,7 +461,7 @@ pub const Builder = struct {
     }
 
     pub fn addUserInputFlag(self: &Builder, name: []const u8) -> bool {
-        test (%%self.user_input_options.put(name, UserInputOption {
+        if (%%self.user_input_options.put(name, UserInputOption {
             .name = name,
             .value = UserValue.Flag,
             .used = false,
@@ -530,7 +530,7 @@ pub const Builder = struct {
         exe_path: []const u8, args: []const []const u8) -> %void
     {
         if (self.verbose) {
-            test (cwd) |yes_cwd| %%io.stderr.print("cd {}; ", yes_cwd);
+            if (cwd) |yes_cwd| %%io.stderr.print("cd {}; ", yes_cwd);
             %%io.stderr.print("{}", exe_path);
             for (args) |arg| {
                 %%io.stderr.print(" {}", arg);
@@ -821,7 +821,7 @@ pub const LibExeObjStep = struct {
     }
 
     pub fn getOutputPath(self: &LibExeObjStep) -> []const u8 {
-        test (self.output_path) |output_path| {
+        if (self.output_path) |output_path| {
             output_path
         } else {
             %%os.path.join(self.builder.allocator, self.builder.cache_root, self.out_filename)
@@ -833,7 +833,7 @@ pub const LibExeObjStep = struct {
     }
 
     pub fn getOutputHPath(self: &LibExeObjStep) -> []const u8 {
-        test (self.output_h_path) |output_h_path| {
+        if (self.output_h_path) |output_h_path| {
             output_h_path
         } else {
             %%os.path.join(self.builder.allocator, self.builder.cache_root, self.out_h_filename)
@@ -885,7 +885,7 @@ pub const LibExeObjStep = struct {
         };
         %%zig_args.append(cmd);
 
-        test (self.root_src) |root_src| {
+        if (self.root_src) |root_src| {
             %%zig_args.append(builder.pathFromRoot(root_src));
         }
 
@@ -950,7 +950,7 @@ pub const LibExeObjStep = struct {
             },
         }
 
-        test (self.linker_script) |linker_script| {
+        if (self.linker_script) |linker_script| {
             %%zig_args.append("--linker-script");
             %%zig_args.append(linker_script);
         }
@@ -1059,7 +1059,7 @@ pub const TestStep = struct {
             builtin.Mode.ReleaseFast => %%zig_args.append("--release-fast"),
         }
 
-        test (self.filter) |filter| {
+        if (self.filter) |filter| {
             %%zig_args.append("--test-filter");
             %%zig_args.append(filter);
         }
@@ -1203,7 +1203,7 @@ pub const CLibExeObjStep = struct {
     }
 
     pub fn getOutputPath(self: &CLibExeObjStep) -> []const u8 {
-        test (self.output_path) |output_path| {
+        if (self.output_path) |output_path| {
             output_path
         } else {
             %%os.path.join(self.builder.allocator, self.builder.cache_root, self.out_filename)
@@ -1492,7 +1492,7 @@ pub const CommandStep = struct {
     fn make(step: &Step) -> %void {
         const self = @fieldParentPtr(CommandStep, "step", step);
 
-        const cwd = test (self.cwd) |cwd| self.builder.pathFromRoot(cwd) else null;
+        const cwd = if (self.cwd) |cwd| self.builder.pathFromRoot(cwd) else null;
         return self.builder.spawnChildEnvMap(cwd, self.env_map, self.exe_path, self.args);
     }
 };
std/debug.zig
@@ -98,13 +98,13 @@ pub fn writeStackTrace(out_stream: &io.OutStream, allocator: &mem.Allocator, tty
                     continue;
                 };
                 const compile_unit_name = %return compile_unit.die.getAttrString(st, DW.AT_name);
-                try (getLineNumberInfo(st, compile_unit, usize(return_address) - 1)) |line_info| {
+                if (getLineNumberInfo(st, compile_unit, usize(return_address) - 1)) |line_info| {
                     defer line_info.deinit();
                     %return out_stream.print(WHITE ++ "{}:{}:{}" ++ RESET ++ ": " ++
                         DIM ++ ptr_hex ++ " in ??? ({})" ++ RESET ++ "\n",
                         line_info.file_name, line_info.line, line_info.column,
                         return_address, compile_unit_name);
-                    try (printLineFromFile(st.allocator(), out_stream, line_info)) {
+                    if (printLineFromFile(st.allocator(), out_stream, line_info)) {
                         if (line_info.column == 0) {
                             %return out_stream.write("\n");
                         } else {
@@ -679,7 +679,7 @@ fn getLineNumberInfo(st: &ElfStackTrace, compile_unit: &const CompileUnit, targe
                     DW.LNE_end_sequence => {
                         //%%io.stdout.printf("  [0x{x8}]  End Sequence\n", pos);
                         prog.end_sequence = true;
-                        test (%return prog.checkLineMatch()) |info| return info;
+                        if (%return prog.checkLineMatch()) |info| return info;
                         return error.MissingDebugInfo;
                     },
                     DW.LNE_set_address => {
@@ -717,14 +717,14 @@ fn getLineNumberInfo(st: &ElfStackTrace, compile_unit: &const CompileUnit, targe
                 //%%io.stdout.printf(
                 //    "  [0x{x8}]  Special opcode {}: advance Address by {} to 0x{x} and Line by {} to {}\n",
                 //    pos, adjusted_opcode, inc_addr, prog.address, inc_line, prog.line);
-                test (%return prog.checkLineMatch()) |info| return info;
+                if (%return prog.checkLineMatch()) |info| return info;
                 prog.basic_block = false;
             } else {
                 switch (opcode) {
                     DW.LNS_copy => {
                         //%%io.stdout.printf("  [0x{x8}]  Copy\n", pos);
 
-                        test (%return prog.checkLineMatch()) |info| return info;
+                        if (%return prog.checkLineMatch()) |info| return info;
                         prog.basic_block = false;
                     },
                     DW.LNS_advance_pc => {
@@ -828,8 +828,8 @@ fn scanAllCompileUnits(st: &ElfStackTrace) -> %void {
             return error.InvalidDebugInfo;
 
         const pc_range = {
-            try (compile_unit_die.getAttrAddr(DW.AT_low_pc)) |low_pc| {
-                test (compile_unit_die.getAttr(DW.AT_high_pc)) |high_pc_value| {
+            if (compile_unit_die.getAttrAddr(DW.AT_low_pc)) |low_pc| {
+                if (compile_unit_die.getAttr(DW.AT_high_pc)) |high_pc_value| {
                     const pc_end = switch (*high_pc_value) {
                         FormValue.Address => |value| value,
                         FormValue.Const => |value| {
@@ -867,7 +867,7 @@ fn scanAllCompileUnits(st: &ElfStackTrace) -> %void {
 
 fn findCompileUnit(st: &ElfStackTrace, target_address: u64) -> ?&const CompileUnit {
     for (st.compile_unit_list.toSlice()) |*compile_unit| {
-        test (compile_unit.pc_range) |range| {
+        if (compile_unit.pc_range) |range| {
             if (target_address >= range.start and target_address < range.end)
                 return compile_unit;
         }
std/hash_map.zig
@@ -247,7 +247,7 @@ test "basicHashMapTest" {
     assert((??map.get(2)).value == 22);
     _ = map.remove(2);
     assert(map.remove(2) == null);
-    assert(test (map.get(2)) false else true);
+    assert(map.get(2) == null);
 }
 
 fn hash_i32(x: i32) -> u32 {
std/linked_list.zig
@@ -43,7 +43,7 @@ pub fn LinkedList(comptime T: type) -> type {
         ///     new_node: Pointer to the new node to insert.
         pub fn insertAfter(list: &List, node: &Node, new_node: &Node) {
             new_node.prev = node;
-            test (node.next) |next_node| {
+            if (node.next) |next_node| {
                 // Intermediate node.
                 new_node.next = next_node;
                 next_node.prev = new_node;
@@ -64,7 +64,7 @@ pub fn LinkedList(comptime T: type) -> type {
         ///     new_node: Pointer to the new node to insert.
         pub fn insertBefore(list: &List, node: &Node, new_node: &Node) {
             new_node.next = node;
-            test (node.prev) |prev_node| {
+            if (node.prev) |prev_node| {
                 // Intermediate node.
                 new_node.prev = prev_node;
                 prev_node.next = new_node;
@@ -83,7 +83,7 @@ pub fn LinkedList(comptime T: type) -> type {
         /// Arguments:
         ///     new_node: Pointer to the new node to insert.
         pub fn append(list: &List, new_node: &Node) {
-            test (list.last) |last| {
+            if (list.last) |last| {
                 // Insert after last.
                 list.insertAfter(last, new_node);
             } else {
@@ -97,7 +97,7 @@ pub fn LinkedList(comptime T: type) -> type {
         /// Arguments:
         ///     new_node: Pointer to the new node to insert.
         pub fn prepend(list: &List, new_node: &Node) {
-            test (list.first) |first| {
+            if (list.first) |first| {
                 // Insert before first.
                 list.insertBefore(first, new_node);
             } else {
@@ -116,7 +116,7 @@ pub fn LinkedList(comptime T: type) -> type {
         /// Arguments:
         ///     node: Pointer to the node to be removed.
         pub fn remove(list: &List, node: &Node) {
-            test (node.prev) |prev_node| {
+            if (node.prev) |prev_node| {
                 // Intermediate node.
                 prev_node.next = node.next;
             } else {
@@ -124,7 +124,7 @@ pub fn LinkedList(comptime T: type) -> type {
                 list.first = node.next;
             }
 
-            test (node.next) |next_node| {
+            if (node.next) |next_node| {
                 // Intermediate node.
                 next_node.prev = node.prev;
             } else {
test/cases/null.zig
@@ -3,7 +3,7 @@ const assert = @import("std").debug.assert;
 test "nullableType" {
     const x : ?bool = @generatedCode(true);
 
-    test (x) |y| {
+    if (x) |y| {
         if (y) {
             // OK
         } else {
@@ -29,7 +29,7 @@ test "nullableType" {
 test "test maybe object and get a pointer to the inner value" {
     var maybe_bool: ?bool = true;
 
-    test (maybe_bool) |*b| {
+    if (maybe_bool) |*b| {
         *b = false;
     }
 
@@ -50,7 +50,7 @@ test "maybe return" {
 
 fn maybeReturnImpl() {
     assert(??foo(1235));
-    test (foo(null))
+    if (foo(null) != null)
         unreachable;
     assert(!??foo(1234));
 }
@@ -66,10 +66,10 @@ test "ifVarMaybePointer" {
 }
 fn shouldBeAPlus1(p: &const Particle) -> u64 {
     var maybe_particle: ?Particle = *p;
-    test (maybe_particle) |*particle| {
+    if (maybe_particle) |*particle| {
         particle.a += 1;
     }
-    test (maybe_particle) |particle| {
+    if (maybe_particle) |particle| {
         return particle.a;
     }
     return 0;
@@ -116,7 +116,7 @@ fn nullableVoidImpl() {
 }
 
 fn bar(x: ?void) -> ?void {
-    test (x) {
+    if (x) |_| {
         return {};
     } else {
         return null;
test/cases/try.zig
@@ -7,7 +7,7 @@ test "tryOnErrorUnion" {
 }
 
 fn tryOnErrorUnionImpl() {
-    const x = try (returnsTen()) |val| {
+    const x = if (returnsTen()) |val| {
         val + 1
     } else |err| switch (err) {
         error.ItBroke, error.NoMem => 1,
@@ -24,16 +24,16 @@ fn returnsTen() -> %i32 {
 }
 
 test "tryWithoutVars" {
-    const result1 = try (failIfTrue(true)) {
+    const result1 = if (failIfTrue(true)) {
         1
-    } else {
+    } else |_| {
         i32(2)
     };
     assert(result1 == 2);
 
-    const result2 = try (failIfTrue(false)) {
+    const result2 = if (failIfTrue(false)) {
         1
-    } else {
+    } else |_| {
         i32(2)
     };
     assert(result2 == 1);
@@ -48,7 +48,7 @@ fn failIfTrue(ok: bool) -> %void {
 }
 
 test "try then not executed with assignment" {
-    try (failIfTrue(true)) {
+    if (failIfTrue(true)) {
         unreachable;
     } else |err| {
         assert(err == error.ItBroke);
test/compile_errors.zig
@@ -118,38 +118,20 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\}
     , ".tmp_source.zig:5:5: error: invalid token: 'var'");
 
-    cases.add("implicit semicolon - try statement",
-        \\export fn entry() {
-        \\    try (foo()) {}
-        \\    var good = {};
-        \\    try (foo()) ({})
-        \\    var bad = {};
-        \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
-
-    cases.add("implicit semicolon - try expression",
-        \\export fn entry() {
-        \\    _ = try (foo()) {};
-        \\    var good = {};
-        \\    _ = try (foo()) {}
-        \\    var bad = {};
-        \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
-
     cases.add("implicit semicolon - test statement",
         \\export fn entry() {
-        \\    test (foo()) {}
+        \\    if (foo()) |_| {}
         \\    var good = {};
-        \\    test (foo()) ({})
+        \\    if (foo()) |_| ({})
         \\    var bad = {};
         \\}
     , ".tmp_source.zig:5:5: error: invalid token: 'var'");
 
     cases.add("implicit semicolon - test expression",
         \\export fn entry() {
-        \\    _ = test (foo()) {};
+        \\    _ = if (foo()) |_| {};
         \\    var good = {};
-        \\    _ = test (foo()) {}
+        \\    _ = if (foo()) |_| {}
         \\    var bad = {};
         \\}
     , ".tmp_source.zig:5:5: error: invalid token: 'var'");
@@ -500,9 +482,9 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
 
     cases.add("invalid maybe type",
         \\export fn f() {
-        \\    test (true) |x| { }
+        \\    if (true) |x| { }
         \\}
-    , ".tmp_source.zig:2:11: error: expected nullable type, found 'bool'");
+    , ".tmp_source.zig:2:9: error: expected nullable type, found 'bool'");
 
     cases.add("cast unreachable",
         \\fn f() -> i32 {
test/tests.zig
@@ -349,7 +349,7 @@ pub const CompareOutputContext = struct {
         switch (case.special) {
             Special.Asm => {
                 const annotated_case_name = %%fmt.allocPrint(self.b.allocator, "assemble-and-link {}", case.name);
-                test (self.test_filter) |filter| {
+                if (self.test_filter) |filter| {
                     if (mem.indexOf(u8, annotated_case_name, filter) == null)
                         return;
                 }
@@ -373,7 +373,7 @@ pub const CompareOutputContext = struct {
                 for ([]Mode{Mode.Debug, Mode.ReleaseFast}) |mode| {
                     const annotated_case_name = %%fmt.allocPrint(self.b.allocator, "{} {} ({})",
                         "compare-output", case.name, @enumTagName(mode));
-                    test (self.test_filter) |filter| {
+                    if (self.test_filter) |filter| {
                         if (mem.indexOf(u8, annotated_case_name, filter) == null)
                             continue;
                     }
@@ -399,7 +399,7 @@ pub const CompareOutputContext = struct {
             },
             Special.DebugSafety => {
                 const annotated_case_name = %%fmt.allocPrint(self.b.allocator, "safety {}", case.name);
-                test (self.test_filter) |filter| {
+                if (self.test_filter) |filter| {
                     if (mem.indexOf(u8, annotated_case_name, filter) == null)
                         return;
                 }
@@ -620,7 +620,7 @@ pub const CompileErrorContext = struct {
         for ([]Mode{Mode.Debug, Mode.ReleaseFast}) |mode| {
             const annotated_case_name = %%fmt.allocPrint(self.b.allocator, "compile-error {} ({})",
                 case.name, @enumTagName(mode));
-            test (self.test_filter) |filter| {
+            if (self.test_filter) |filter| {
                 if (mem.indexOf(u8, annotated_case_name, filter) == null)
                     continue;
             }
@@ -655,7 +655,7 @@ pub const BuildExamplesContext = struct {
         const b = self.b;
 
         const annotated_case_name = b.fmt("build {} (Debug)", build_file);
-        test (self.test_filter) |filter| {
+        if (self.test_filter) |filter| {
             if (mem.indexOf(u8, annotated_case_name, filter) == null)
                 return;
         }
@@ -686,7 +686,7 @@ pub const BuildExamplesContext = struct {
         for ([]Mode{Mode.Debug, Mode.ReleaseFast}) |mode| {
             const annotated_case_name = %%fmt.allocPrint(self.b.allocator, "build {} ({})",
                 root_src, @enumTagName(mode));
-            test (self.test_filter) |filter| {
+            if (self.test_filter) |filter| {
                 if (mem.indexOf(u8, annotated_case_name, filter) == null)
                     continue;
             }
@@ -874,7 +874,7 @@ pub const ParseHContext = struct {
         const b = self.b;
 
         const annotated_case_name = %%fmt.allocPrint(self.b.allocator, "parseh {}", case.name);
-        test (self.test_filter) |filter| {
+        if (self.test_filter) |filter| {
             if (mem.indexOf(u8, annotated_case_name, filter) == null)
                 return;
         }