Bug 1316 – Can't directly reference members of CTFE struct arrays

Two variations, with different error messages. ---------------- struct S { int a; } int func() { S [] s = [S(7)]; return s[0].a; // Error: cannot evaluate func() at compile time } void main() { const int x = func(); } -------------- VARIANT 2 (attempted workaround): -------------- struct S { int a; } int func() { S [] s = [S(7)]; return (s[0]).a; // Fails: // bug.d(9): Error: s is used as a type // bug.d(9): Error: no property 'a' for type 'void[0u]' } void main() { const int x = func(); } ---------- Workaround is to index the array first, then access the member. ---------- int func() { S [] s = [S(7)]; auto q = s[0]; return q.a; // OK }

The first (and most important) variant seems to have been fixed in DMD 1.019.

Variant 1 works fine now. Regarding Variant 2: the parentheses in (s[0]) are redundant. The parser interprets them as an attempt at a C-style cast where s[0] then must be a type. I prefer to leave that in, as it diagnoses attempts to use C-style casts. To fix the code, just remove the redundant parentheses.