Bug 12883 – implicit conversion of struct to mutable via alias this

--- static struct S { int x; void* dummy; @property S mutable() const {return S(42);} alias mutable this; } void main() { const c = S(13); S m1 = c; assert(m1.x == 42); S m2; m2 = c; assert(m2.x == 42); static void f(S s) {assert(s.x == 42);} f(c); } --- Pull request is on the way.

With struct type S, copy operation from const S to mutable S should be handled postblit always. So, 'alias this' never be considered in the case, and this is invalid issue.

This is a valid issue. Alias this should be employed if a copy constructor is not defined.

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