Commit ecb77af534

@@ -0,0 +1,38 @@
+const std = @import("std");
+
+pub const GET = struct {
+    key: []const u8,
+
+    pub fn init(key: []const u8) GET {
+        return .{ .key = key };
+    }
+
+    pub const Redis = struct {
+        pub const Command = struct {
+            pub fn serialize(self: GET, comptime rootSerializer: type) void {
+                return rootSerializer.serializeCommand(.{ "GET", self.key });
+            }
+        };
+    };
+};
+
+pub fn isCommand(comptime T: type) bool {
+    const tid = @typeId(T);
+    return (tid == .Struct or tid == .Enum or tid == .Union) and
+        @hasDecl(T, "Redis") and @hasDecl(T.Redis, "Command");
+}
+
+pub const ArgSerializer = struct {
+    pub fn serializeCommand(command: var) void {
+        const CmdT = @typeOf(command);
+
+        if (comptime isCommand(CmdT)) {
+            // COMMENTING THE NEXT LINE REMOVES THE ERROR
+            return CmdT.Redis.Command.serialize(command, ArgSerializer);
+        }
+    }
+};
+
+test "fixed" {
+    ArgSerializer.serializeCommand(GET.init("banana"));
+}

@@ -38,6 +38,7 @@ comptime {
     _ = @import("behavior/bugs/3112.zig");
     _ = @import("behavior/bugs/3367.zig");
     _ = @import("behavior/bugs/3384.zig");
+    _ = @import("behavior/bugs/3742.zig");
     _ = @import("behavior/bugs/394.zig");
     _ = @import("behavior/bugs/421.zig");
     _ = @import("behavior/bugs/529.zig");