Ensure the symbols are pure strings

Author: Zoxc

src/libsyntax/ast.rs

@@ -70,7 +70,13 @@ pub struct Path {
 
 impl PartialEq<Symbol> for Path {
     fn eq(&self, symbol: &Symbol) -> bool {
-        self.segments.len() == 1 && self.segments[0].ident.name.interned() == *symbol
+        self.segments.len() == 1 && {
+            let name = self.segments[0].ident.name;
+            // Make sure these symbols are pure strings
+            debug_assert!(!symbol.is_gensymed());
+            debug_assert!(!name.is_gensymed());
+            name == *symbol
+        }
     }
 }