From 74a29b912aaa14dbeb7e5c51ae11c61e733ef645 Mon Sep 17 00:00:00 2001
From: Martin Fischer <martin@push-f.com>
Date: Thu, 25 Nov 2021 13:44:20 +0100
Subject: better error for qualified associated types

---
 src/lib.rs                                   | 3 +++
 src/transform.rs                             | 4 ++++
 ui-tests/src/bin/qualified_assoc_type.stderr | 2 +-
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index 4c1675c..fc559bc 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -155,6 +155,9 @@ pub fn dynamize(_attr: TokenStream, input: TokenStream) -> TokenStream {
                             n
                         )
                     }
+                    MethodError::Transform(TransformError::QualifiedAssociatedType) => {
+                        return abort!(span, "dynamize does not support qualified associated types")
+                    }
                     MethodError::Transform(TransformError::QualifiedSelfAssociatedType) => {
                         return abort!(span, "dynamize does not support associated types of a qualified Self")
                     }
diff --git a/src/transform.rs b/src/transform.rs
index 74ab9e6..eed48c4 100644
--- a/src/transform.rs
+++ b/src/transform.rs
@@ -26,6 +26,7 @@ pub enum TransformError {
     UnsupportedType,
     ExpectedAtLeastNTypes(usize),
     AssocTypeAfterFirstNTypes(usize, Ident),
+    QualifiedAssociatedType,
     QualifiedSelfAssociatedType,
 }
 
@@ -119,6 +120,9 @@ impl TypeConverter<'_> {
         {
             if let Type::Path(self_path) = qself.ty.as_ref() {
                 if self_path.path.segments[0].ident == "Self" {
+                    if !self_path.path.is_ident("Self") {
+                        return Err((self_path.span(), TransformError::QualifiedAssociatedType));
+                    }
                     return Err((
                         self_path.span(),
                         TransformError::QualifiedSelfAssociatedType,
diff --git a/ui-tests/src/bin/qualified_assoc_type.stderr b/ui-tests/src/bin/qualified_assoc_type.stderr
index 4f69ece..0401509 100644
--- a/ui-tests/src/bin/qualified_assoc_type.stderr
+++ b/ui-tests/src/bin/qualified_assoc_type.stderr
@@ -1,4 +1,4 @@
-error: dynamize does not support associated types of a qualified Self
+error: dynamize does not support qualified associated types
  --> src/bin/qualified_assoc_type.rs:9:24
   |
 9 |     fn test(&self) -> <Self::A as Foo>::B;
-- 
cgit v1.2.3