Bug 6216 – Built-in opAssign implicitly defined should call field's opAssign

Following should compile. ---- struct X { int n; const void opAssign(const X rhs) {} } struct S { int n; const(X) x; } void main() { S s; s = s; } ---- test.d(14): Error: variable test.main.s cannot modify struct with immutable members ---- S has implicitly defined opAssign, but it does not call field x's opAssign.

Commit pushed to master at https://github.com/D-Programming-Language/dmd https://github.com/D-Programming-Language/dmd/commit/b9896d14766fe5a067cf84d0d2c21418dfb35676 fix Issue 6216 - Built-in opAssign implicitly defined should call field's opAssign Separate 'top assignable' (see opAssign first) from 'blit assignable' (memberwise), and now they are not related to 'modifiable' directly.