Bug 13904 – calls to mutable methods are just ignored when instance is an enum

the following code compiles and runs, and prints '10' twice. I expect it not to compile, since x is an enum. If x is declared as 'immutable S', it does not compile. import std.stdio; struct S { uint value; void setValue(uint v) { value = v; } } int main() { enum S x = S(10); writeln(x); x.setValue(20); writeln(x); return 0; }

*** Issue 13905 has been marked as a duplicate of this issue. ***

This is actually not a bug. enum S x = S(10); x.setValue(20); is rewritten to be: S(10).setValue(20); which is then rewritten to be: auto tmp = S(10); tmp.setValue(20); which works as expected.