diff options
Diffstat (limited to 'compiler/rustc_builtin_macros/src/deriving/mod.rs')
| -rw-r--r-- | compiler/rustc_builtin_macros/src/deriving/mod.rs | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/compiler/rustc_builtin_macros/src/deriving/mod.rs b/compiler/rustc_builtin_macros/src/deriving/mod.rs index a6f3252e7be..8a3375cba9d 100644 --- a/compiler/rustc_builtin_macros/src/deriving/mod.rs +++ b/compiler/rustc_builtin_macros/src/deriving/mod.rs @@ -123,6 +123,8 @@ fn assert_ty_bounds( span: Span, assert_path: &[Symbol], ) { + // Deny anonymous structs or unions to avoid wierd errors. + assert!(!ty.kind.is_anon_adt(), "Anonymous structs or unions cannot be type parameters"); // Generate statement `let _: assert_path<ty>;`. let span = cx.with_def_site_ctxt(span); let assert_path = cx.path_all(span, true, cx.std_path(assert_path), vec![GenericArg::Type(ty)]); |