[llvm-bugs] [Bug 46714] New: Diagnostic enhancement: "auto" in lambda expression under -std=c++11

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46714

            Bug ID: 46714
           Summary: Diagnostic enhancement: "auto" in lambda expression
                    under -std=c++11
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: haoxintu at gmail.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

Hi, all.

"auto" used in lambda expression is a c++14 extension, but clang doesn't emit
the appropriate diagnostic message about it.

For example,

$cat test.cc
int main(){
    auto var = [](auto){};
    return 0;
}

$clang++ -std=c++11 -c test.cc
test.cc:2:19: error: 'auto' not allowed in lambda parameter
    auto var = [](auto){};
                  ^~~~
1 error generated.

I guess clang should give a more specific diagnostic about this like GCC.

$g++ -std=c++11 -c test.cc
test.cc: In function ‘int main()’:
test.cc:2:19: error: use of ‘auto’ in lambda parameter declaration only
available with ‘-std=c++14’ or ‘-std=gnu++14’
    2 |     auto var = [](auto){};
      |                   ^~~~

Just a small enhancement I guess, please understand if anything I stated is
unsuitable.

Thanks,
Haoxin

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