Bug 22870 – __traits(parent) with opApply returns generated delegate instead of lexical parent

As of DMD 2.099.0, the following program fails to compile: --- struct HasOpApply { int opApply(int delegate(int) dg) { if (int result = dg(0)) return result; return 0; } } void main() { foreach (x; 0 .. 1) { // ok static assert(__traits(identifier, __traits(parent, {})) == "main"); } foreach (x; HasOpApply()) { // error static assert(__traits(identifier, __traits(parent, {})) == "main"); } } --- The error is: --- onlineapp.d(21): Error: static assert: `"__foreachbody5" == "main"` is false --- This happens because __traits(parent) is evaluated after the compiler has transformed the foreach loop into a call to HasOpApply.opApply.

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