[Issue 9620] New: Error messages of failed pure enforcement

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9620

           Summary: Error messages of failed pure enforcement
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Keywords: diagnostic
          Severity: minor
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2013-02-28 19:59:45 PST ---
I don't know if this is a bug, or if it's OK.


This is wrong code:


import std.range: chain;
void main() pure {
    static void foo() {
        int[] a;
        chain(a, a);
    }
    foo();
}



DMD 2.063alpha gives:

test1.d(5): Error: pure function 'main' cannot call impure function 'chain'

Is it right for the error message to say that main calls chain (while it's
called by foo)?



This similar code is a simpler example:


void foo(int[]) {}
void main() pure {
    static void bar() {
        int[] a;
        foo(a);
    }
    bar();
}


It gives:

test2.d(5): Error: pure function 'D main' cannot call impure function
'test2.foo'

Note how in the first error message dmd uses 'main' and in the second 'D main'.
I don't know why there is such difference.

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