[Issue 13899] New: Unwanted warning for pure opApply

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13899

          Issue ID: 13899
           Summary: Unwanted warning for pure opApply
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Keywords: diagnostic
          Severity: minor
          Priority: P1
         Component: DMD
          Assignee: nobody at puremagic.com
          Reporter: bearophile_hugs at eml.cc

I think the compiler should not generate a warning in this case:



const struct Foo {
    int opApply(immutable int delegate(in ref int) pure nothrow dg)
    pure nothrow {
        return 1;
    }
}
void main() {
    foreach (x; Foo()) {}
}


dmd 2.067alpha gives:

test.d(7,5): Warning: calling test.Foo.opApply without side effects discards
return value of type int, prepend a cast(void) if intentional

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