https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84917
Bug ID: 84917
Summary: Verbosity when dealing with nested template data
structures
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c++
Assignee: dmalcolm at gcc dot gnu.org
Reporter: dmalcolm at gcc dot gnu.org
Target Milestone: ---
In
https://www.reddit.com/r/programming/comments/84oizv/usability_improvements_in_gcc_8/dvsa8dw/
Reddit user "rifeid" reports excess verbosity...
> [...] when dealing with nested template data structures. For example,
#include <string>
#include <vector>
using vec = std::vector<std::string>;
void blah() {
vec x;
x.foo();
}
> results in
test.cpp: In function ‘void blah()’:
test.cpp:6:4: error: ‘using vec = class
std::vector<std::__cxx11::basic_string<char> > {aka class
std::vector<std::__cxx11::basic_string<char> >}’ has no member named ‘foo’
x.foo();
^~~
> My issues with this:
>
> It may look better if the error: line just uses vec, and
> have the full expansion relegated to a note: line. Not sure.
>
> The expansion is printed twice.
>
> As std::string is part of the C++ standard, I'd prefer it unexpanded.
Confirmed on godbolt.org.
I think parts of these are a dup (maybe of PR c++/84360) but it seems worth
capturing here and fixing.
