Bug 6578 – Ignored const with struct with constructor

In DMD 2.055head this compiles and runs with no errors: struct Foo { int x; this(int x_) { this.x = x_; } } void main() { auto f1 = new const(Foo)(1); f1.x++; auto f2 = new immutable(Foo)(1); f2.x++; auto f3 = const(Foo)(1); f3.x++; auto f4 = immutable(Foo)(1); f4.x++; } While this generates two errors: struct Foo { int x; } void main() { auto f5 = const(Foo)(1); f5.x++; // error auto f6 = immutable(Foo)(1); f6.x++; // error } I think in the first program the f1,f2,f3,f4 structs too need to raise a compile-time error. Thanks to Timon Gehr for a suggestion.

The devil's patch: https://github.com/D-Programming-Language/dmd/pull/666

*** Issue 9647 has been marked as a duplicate of this issue. ***

Commits pushed to master at https://github.com/D-Programming-Language/dmd https://github.com/D-Programming-Language/dmd/commit/b133ffbad523c03c11a3253595fb4edf1ccc53b4 Issue 6578 - Wrong type deduction for NewExp and __ctor with struct Add the constructor's modifiers to the result type, instead of replacing them. https://github.com/D-Programming-Language/dmd/commit/a319e6d4c70de1fcc28a21b743d3367fb533e116 Merge pull request #666 from yebblies/issue6578 Issue 6578 - Wrong type deduction for NewExp and __ctor with struct

Yet another test case: struct S { this(int[] arr) immutable {} } void main() { auto s = S([1,2,3]); pragma(msg, typeof(s)); // prints immutable(S) } Can be fixed by: https://github.com/D-Programming-Language/dmd/pull/1726

(In reply to comment #4) > Yet another test case: > > struct S { > this(int[] arr) immutable {} > } > void main() { > auto s = S([1,2,3]); > pragma(msg, typeof(s)); // prints immutable(S) > } > > Can be fixed by: > https://github.com/D-Programming-Language/dmd/pull/1726 Pull-request 1726 is merged, and this issue has been fixed properly.