[Issue 7197] New: enum string doesn't work with CTFE

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7197

           Summary: enum string doesn't work with CTFE
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Mac OS X
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: andrei at metalanguage.com


--- Comment #0 from Andrei Alexandrescu <andrei at metalanguage.com> 2012-01-01 17:44:07 PST ---
import std.stdio;

string toConcatenatedForm(string m, string[] args...)
{
    string result = "q{";
    for (;;)
    {
        if (!m.length)
        {
            return result ~ '}';
        }
        if (m[0] != '$')
        {
            result ~= m[0];
            m = m[1 .. $];
            continue;
        }
        if (m[1] >= '1' && m[1] <= '9')
        {
            result ~= "} ~ ";
            result ~= "expand!(q{" ~ args[m[1] - '1'] ~ "}) ~ q{";
            m = m[2 .. $];
            continue;
        }
    }
}

template expand(string m, args...)
{
    enum string expand = mixin(toConcatenatedForm(m, args));
}

unittest
{
    enum string s = expand!("$1", "abc");
    writeln(s);
    writeln(expand!("$1", s));
}

void main(){}

The code above causes an ICE:

Assertion failed: (v->ctfeAdrOnStack >= 0 && v->ctfeAdrOnStack <
stackPointer()), function setValue, file interpret.c, line 100.

Replacing the first line in the unittest with

    static immutable string s = expand!("$1", "abc");

makes the code work.

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