import std.conv; struct T { int[] i; string[string] ss; }void foo(ref T t) { } void main() { T t1; auto t2 = immutable T(); foo(t1); foo(cast()t2); }
It works as it should. Make a mutable copy of t2 and pass it. Or make foo() accept const. I can't imagine a single legitimate use case for destroying type system in a way you want.
