IDE users pretending compilers don't exist.

$ guix shell gcc

[env]$ g++ test.cpp 
test.cpp:4:16: warning: `0;' is not in NFC [-Wnormalized=]
    4 |         return 0<U+037E>
      |                ^~~~~~~~~
test.cpp: In function ‘int main()’:
test.cpp:4:16: error: unable to find numeric literal operator ‘operator"";’
test.cpp:4:18: error: expected ‘;’ before ‘}’ token
    4 |         return 0;
      |                  ^
      |                  ;
    5 | }
      | ~

Look ma, no IDE! 😸