[Clang] Duplicate diagnostics in C++20+ mode: incomplete type in nested name specifier #147000
Description
Clang emits duplicate diagnostics when compiling the following code in C++20+ mode:
struct incomplete; incomplete::type var;Output:
<source>:2:1: error: incomplete type 'incomplete' named in nested name specifier 2 | incomplete::type var; | ^~~~~~~~~~~~ <source>:1:8: note: forward declaration of 'incomplete' 1 | struct incomplete; | ^ <source>:2:1: error: incomplete type 'incomplete' named in nested name specifier 2 | incomplete::type var; | ^~~~~~~~~~~~ <source>:1:8: note: forward declaration of 'incomplete' 1 | struct incomplete; | ^Compiler Explorer: https://godbolt.org/z/fPo1W7c1n