sepavloff added a comment.
The issue is still observed in trunk. Other compilers process the tests
correctly (checked using https://godbolt.org/). For instance, the code:
template<typename T> struct C20 {
friend void func_20() {} // expected-note{{previous definition is here}}
};
C20<int> c20i;
void func_20() {} // expected-error{{redefinition of 'func_20'}}
is rejected by gcc 7.3:
<source>: In function 'void func_20()':
<source>:5:6: error: redefinition of 'void func_20()'
void func_20() {} // expected-error{{redefinition of 'func_20'}}
^~~~~~~
<source>:2:13: note: 'void func_20()' previously declared here
friend void func_20() {} // expected-note{{previous definition is here}}
^~~~~~~
Compiler returned: 1
by ICC 18:
<source>(5): error: function "func_20" has already been defined
void func_20() {} // expected-error{{redefinition of 'func_20'}}
^
compilation aborted for <source> (code 2)
Compiler returned: 2
and by MSVC 19 2017:
<source>(5): error C2084: function 'void C20<int>::func_20(void)' already has
a body
<source>(2): note: see previous definition of 'func_20'
Microsoft (R) C/C++ Optimizing Compiler Version 19.10.25017 for x64
Copyright (C) Microsoft Corporation. All rights reserved.
Compiler returned: 2
https://reviews.llvm.org/D30170
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