https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109356
--- Comment #3 from Jonny Grant <jg at jguk dot org> --- A different example where GCC does a good job of indicating the line number of a missing comma problem. https://godbolt.org/z/asGhE3W17 <source>:6:5: error: expected '}' before '{' token 6 | {"G", "H"}, | ^ <source>:2:1: note: to match this '{' 2 | { | ^ <source>:6:5: error: expected ',' or ';' before '{' token 6 | {"G", "H"}, | ^