Bug 14393 – 'is' operator gives inconsistent results at runtime and compile-time for array duplication

enum int[] a = [1, 2]; enum int[int] aa = [1: 2, 3: 4]; // Mimics builtin dup semantics for dynamic arrays int[] mydup(int[] src) { int[] dst; dst.length = src.length; foreach (i, n; dst) src[i] = n; return dst; } // Mimics builtin dup semantics for associative arrays int[int] mydup(int[int] src) { int[int] dst; foreach (k, v; src) dst[k] = v; return dst; } void main() { assert(a !is a.dup); // OK assert(a !is a.mydup); // OK assert(aa !is aa.dup); // OK assert(aa !is aa.mydup); // OK static assert(a !is a.dup); // Assert error static assert(a !is a.mydup); // OK static assert(aa !is aa.dup); // Assert error static assert(aa !is aa.mydup); // Assert error }

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