If the argument is a CommaExp, set a flag to prevent deprecation messages
It's impossible to know from CommaExp.semantic if the result will
be used, hence when there is a result (type != void), a deprecation
message is always emitted.
However, some construct can produce a result but won't use it
(ExpStatement and for loop increment). Those should call this function
to prevent unwanted deprecations to be emitted.
The D Programming Language's Unofficial Docs
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If the argument is a CommaExp, set a flag to prevent deprecation messages
It's impossible to know from CommaExp.semantic if the result will be used, hence when there is a result (type != void), a deprecation message is always emitted. However, some construct can produce a result but won't use it (ExpStatement and for loop increment). Those should call this function to prevent unwanted deprecations to be emitted.