Language
C++
Compiler
gcc HEAD 10.0.0 20191015 (experimental)
Options
Warnings
Don't Use Boost
C++2a
-pedantic-errors
$ g++ prog.cc -Wall -Wextra -std=c++2a -pedantic-errors Exit Code:
1
C++
gcc HEAD 10.0.0 20191015 (experimental)
$ g++ prog.cc -Wall -Wextra -std=c++2a -pedantic-errors prog.cc: In instantiation of 'auto [requires ::C<<placeholder>, >] f(auto:1) [with auto:1 = int]':
prog.cc:12:15: required from here
prog.cc:7:12: error: deduced return type does not satisfy placeholder constraints
7 | return 42;
| ^~
prog.cc:7:12: note: constraints not satisfied
prog.cc:2:13: note: 'false' is never satisfied
2 | concept C = false;
| ^~~~~