Commit 9e98ea552d

@@ -1289,7 +1289,7 @@ static LLVMValueRef get_merge_err_ret_traces_fn_val(CodeGen *g) {
     LLVMValueRef addr_ptr = LLVMBuildInBoundsGEP(g->builder, src_ptr_val, &ptr_index, 1, "");
     LLVMValueRef this_addr_val = LLVMBuildLoad(g->builder, addr_ptr, "");
     LLVMValueRef args[] = {dest_stack_trace_ptr, this_addr_val};
-    LLVMBuildCall(g->builder, add_error_return_trace_addr_fn_val, args, 2, "");
+    ZigLLVMBuildCall(g->builder, add_error_return_trace_addr_fn_val, args, 2, get_llvm_cc(g, CallingConventionUnspecified), ZigLLVM_FnInlineAlways, "");
     LLVMValueRef prev_frames_left = LLVMBuildLoad(g->builder, frames_left_ptr, "");
     LLVMValueRef new_frames_left = LLVMBuildNUWSub(g->builder, prev_frames_left, usize_one, "");
     LLVMValueRef done_bit = LLVMBuildICmp(g->builder, LLVMIntEQ, new_frames_left, usize_zero, "");
@@ -1358,7 +1358,7 @@ static LLVMValueRef get_return_err_fn(CodeGen *g) {
     LLVMValueRef return_address = LLVMBuildPtrToInt(g->builder, return_address_ptr, usize_type_ref, "");
 
     LLVMValueRef args[] = { err_ret_trace_ptr, return_address };
-    LLVMBuildCall(g->builder, add_error_return_trace_addr_fn_val, args, 2, "");
+    ZigLLVMBuildCall(g->builder, add_error_return_trace_addr_fn_val, args, 2, get_llvm_cc(g, CallingConventionUnspecified), ZigLLVM_FnInlineAlways, "");
     LLVMBuildRetVoid(g->builder);
 
     LLVMPositionBuilderAtEnd(g->builder, prev_block);
@@ -4387,7 +4387,7 @@ static LLVMValueRef ir_render_merge_err_ret_traces(CodeGen *g, IrExecutable *exe
     LLVMValueRef dest_trace_ptr = get_cur_err_ret_trace_val(g, instruction->base.scope);
 
     LLVMValueRef args[] = { dest_trace_ptr, src_trace_ptr };
-    LLVMBuildCall(g->builder, get_merge_err_ret_traces_fn_val(g), args, 2, "");
+    ZigLLVMBuildCall(g->builder, get_merge_err_ret_traces_fn_val(g), args, 2, get_llvm_cc(g, CallingConventionUnspecified), ZigLLVM_FnInlineAuto, "");
     return nullptr;
 }
 

@@ -1,4 +1,5 @@
 const std = @import("std");
+const builtin = @import("builtin");
 const assert = std.debug.assert;
 
 var x: i32 = 1;
@@ -189,3 +190,30 @@ async fn failing() !void {
     suspend;
     return error.Fail;
 }
+
+test "error return trace across suspend points" {
+    const p = nonFailing();
+    resume p;
+    const p2 = try async<std.debug.global_allocator> printTrace(p);
+    cancel p2;
+}
+
+fn nonFailing() promise->error!void {
+    return async<std.debug.global_allocator> suspendThenFail() catch unreachable;
+}
+
+async fn suspendThenFail() error!void {
+    suspend;
+    return error.Fail;
+}
+
+async fn printTrace(p: promise->error!void) void {
+    (await p) catch |e| {
+        std.debug.assert(e == error.Fail);
+        if (@errorReturnTrace()) |trace| {
+            assert(trace.index == 1);
+        } else if (builtin.mode != builtin.Mode.ReleaseFast) {
+            @panic("expected return trace");
+        }
+    };
+}