Bug 980 – If a function tries to concatenate a char to a empty array, dmd complains that the function can't be evaluated at compile time

If a function tries to concatenate a char to a empty char[] array, dmd gives the error "cannot evaluate ... at compile time". The same code works at runtime. The workaround is to simply initialize the string. Code that shows the bug: /* bug.d(12): Error: cannot evaluate (test)(0) at compile time bug.d(13): Error: string expected for message, not '(test)(0)' */ char[] test(int dummy = 0) { char[] s /*= ""*/ ; // Works if comment is removed return s ~ 't'; } void main() { const x = test(); pragma(msg, x); }

Fixed DMD 1.007

Added to DStress as http://dstress.kuehne.cn/compile/o/opCatAssign_22_A.d http://dstress.kuehne.cn/compile/o/opCatAssign_22_B.d http://dstress.kuehne.cn//compile/o/opCat_26_A.d http://dstress.kuehne.cn//compile/o/opCat_26_B.d