cases: test coverage for #11850

Closes #11850

Author: wooster0

test/cases/compile_errors/invalid_struct_field.zig

@@ -1,21 +1,30 @@
-const A = struct { x : i32, };
+const A = struct { x: i32 };
 export fn f() void {
-    var a : A = undefined;
+    var a: A = undefined;
     a.foo = 1;
     const y = a.bar;
     _ = y;
 }
 export fn g() void {
-    var a : A = undefined;
+    var a: A = undefined;
     const y = a.bar;
     _ = y;
 }
+export fn e() void {
+    const B = struct {
+        fn f() void {}
+    };
+    const b: B = undefined;
+    @import("std").debug.print("{}{}", .{ b.f, b.f });
+}
 
 // error
 // backend=stage2
 // target=native
 //
-// :4:7: error: no field named 'foo' in struct 'tmp.A'
+// :4:7: error: no field named 'foo' in struct 'invalid_struct_field.A'
 // :1:11: note: struct declared here
-// :10:17: error: no field named 'bar' in struct 'tmp.A'
-
+// :10:17: error: no field named 'bar' in struct 'invalid_struct_field.A'
+// :1:11: note: struct declared here
+// :18:45: error: no field named 'f' in struct 'invalid_struct_field.e.B'
+// :14:16: note: struct declared here