add compile error for @Frame() of generic function

See #3063

src/analyze.cpp

@@ -5197,6 +5197,8 @@ static Error resolve_async_frame(CodeGen *g, ZigType *frame_type) {
         return ErrorNone;
 
     ZigFn *fn = frame_type->data.frame.fn;
+    assert(!fn->type_entry->data.fn.is_generic);
+
     switch (fn->anal_state) {
         case FnAnalStateInvalid:
             return ErrorSemanticAnalyzeFail;

src/ir.cpp

@@ -22095,6 +22095,12 @@ static IrInstruction *ir_analyze_instruction_frame_type(IrAnalyze *ira, IrInstru
     if (fn == nullptr)
         return ira->codegen->invalid_instruction;
 
+    if (fn->type_entry->data.fn.is_generic) {
+        ir_add_error(ira, &instruction->base,
+                buf_sprintf("@Frame() of generic function"));
+        return ira->codegen->invalid_instruction;
+    }
+
     ZigType *ty = get_fn_frame_type(ira->codegen, fn);
     return ir_const_type(ira, &instruction->base, ty);
 }

test/compile_errors.zig

@@ -2,6 +2,18 @@ const tests = @import("tests.zig");
 const builtin = @import("builtin");
 
 pub fn addCases(cases: *tests.CompileErrorContext) void {
+    cases.add(
+        "@Frame() of generic function",
+        \\export fn entry() void {
+        \\    var frame: @Frame(func) = undefined;
+        \\}
+        \\fn func(comptime T: type) void {
+        \\    var x: T = undefined;
+        \\}
+    ,
+        "tmp.zig:2:16: error: @Frame() of generic function",
+    );
+
     cases.add(
         "@frame() causes function to be async",
         \\export fn entry() void {
@@ -14,6 +26,7 @@ pub fn addCases(cases: *tests.CompileErrorContext) void {
         "tmp.zig:1:1: error: function with calling convention 'ccc' cannot be async",
         "tmp.zig:5:9: note: @frame() causes function to be async",
     );
+
     cases.add(
         "invalid suspend in exported function",
         \\export fn entry() void {