[Issue 7640] New: CTFE: Confusing error message when looking up missing hash key

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7640

           Summary: CTFE: Confusing error message when looking up missing
                    hash key
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: andrej.mitrovich at gmail.com


--- Comment #0 from Andrej Mitrovic <andrej.mitrovich at gmail.com> 2012-03-03 18:23:47 PST ---
enum Enums
{
    a,
    b
}

void main()
{
    enum Fields = 
    [
        Enums.a : "a",
    ];

    mixin("auto x = " ~ Fields[Enums.b] ~ ";");
}

Errors:
test.d(16): Error: argument to mixin must be a string, not ("auto x = " ~
[cast(Enums)0:"a"][cast(Enums)1] ~ ";")
test.d(16): Error: argument to mixin must be a string, not ("auto x = " ~
[cast(Enums)0:"a"][cast(Enums)1] ~ ";")

I'd rather the errors be something like:

test.d(16): Error: CTFE: Key 'Enums.b' is not in 'Fields'
test.d(16): Error: argument to mixin must be a string, not ("auto x = " ~
(__error) ~ ";")

We could also get rid of duplicate error messages.

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