https://issues.dlang.org/show_bug.cgi?id=12591
Issue ID: 12591 Summary: [DMD|REG] std/typecons.d(440): Error: tuple has no effect in expression Product: D Version: D2 Hardware: All OS: All Status: NEW Severity: regression Priority: P1 Component: DMD Assignee: nob...@puremagic.com Reporter: monarchdo...@gmail.com Not sure when it regeressed. Phobos regressed in 2.065. This is the test case: //---- import std.container, std.typecons : tuple; void main() { auto a = Array!int(); tuple(a, a); } //---- std/typecons.d(425): Error: tuple has no effect in expression (tuple(this._expand_field_0.__cpctor(_param_0))) //---- I've reduced it to: //---- struct S(T) //MUST BE TEMPLATE! { this(this) {} } void main() { alias T1 = Tup!(S!int); } struct Tup(Types...) { Types expand; this(Types values) { expand[] = values[]; } } //---- Error: tuple has no effect in expression (tuple(this._expand_field_0.__cpctor(_param_0))) //---- This started failing as of 2.064. --