Is returning void valid code?

by

It’s a language feature of C++

C++ (ISO 14882:2003) 6.6.3/3

A return statement with an expression of type “cv void” can be used only in functions with a return type of cv void; the expression is evaluated just before the function returns to its caller.

C (ISO 9899:1999) 6.8.6.4/1

A return statement with an expression shall not appear in a function whose return type
is void.

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