[hoosieree]

GCC has an extension for nested functions: https://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html#Nes...

Not as nice as anonymous blocks but helps put the function closer to where it's used, which is nice.

[Jtsummers]

Yeah, but the two dominant open source C compilers have chosen different approaches. This makes nested functions (gcc) and blocks (clang) both unusable if you want portable code even between the pair of them (and not generally).