Bug report

Generator<int, int, void, void> accepts no values via send(), but using the return value of yield does not raise an error in this case.

Version is 0.12.5.

Code snippet that reproduces the problem

https://phpstan.org/r/d39c8d97-e3ee-4259-932d-e4b1998aab54

Only one error is reported in this code.

Expected output

An additional error should be reported because the return type of yield is void in this generator.