Feature request

today I stumbled over a bug, in which someone missed to echo the result of a string-concatenation, effectively producing a useless concatenation.

would be great if phpstan could error about the concat beeing useless:
https://phpstan.org/r/b76066d6-5fb9-440b-a1f2-16651b6a062d

same could be true for other operations when no assignment is done
https://phpstan.org/r/ae8ba301-436a-4945-aa39-181d7536620c

Did PHPStan help you today? Did it make you happy in any way?

No response