https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86998
Bug ID: 86998
Summary: Improve diagnostic for missing comma in
template-parameter-list
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Target Milestone: ---
template<typename T typename U> void f() { }
GCC says:
err.cc:1:19: error: expected nested-name-specifier before 'T'
1 | template<typename T typename U> void f() { }
| ^
err.cc:1:21: error: expected '>' before 'typename'
1 | template<typename T typename U> void f() { }
| ^~~~~~~~
The first error is not helpful. The second error is OK, although it would be
more correct (and helpful) to say that a comma would also be accepted, as Clang
does:
err.cc:1:19: error: expected a qualified name after 'typename'
template<typename T typename U> void f() { }
^
err.cc:1:21: error: expected ',' or '>' in template-parameter-list
template<typename T typename U> void f() { }
^
2 errors generated.
I don't know why all of GCC, Clang and EDG say something about a
nested-name-specifier or qualified name for the first template-parameter. I
don't think the grammar allows a qualified-id there, only a plain identifier.
