Forbid !Sized types and references

compiler/rustc_hir_analysis/src/errors.rs

@@ -278,6 +278,14 @@ pub struct CopyImplOnNonAdt {
     pub span: Span,
 }
 
+#[derive(Diagnostic)]
+#[diag(hir_analysis_const_param_ty_impl_on_unsized)]
+pub struct ConstParamTyImplOnUnsized {
+    #[primary_span]
+    #[label]
+    pub span: Span,
+}
+
 #[derive(Diagnostic)]
 #[diag(hir_analysis_const_param_ty_impl_on_non_adt)]
 pub struct ConstParamTyImplOnNonAdt {