[Issue 9947] reduce of an array of structs with an immutable field

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=9947


monarchdodra at gmail.com changed:

           What    |Removed                     |Added
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                 CC|                            |monarchdodra at gmail.com


--- Comment #2 from monarchdodra at gmail.com 2014-02-25 12:27:55 PST ---
(In reply to comment #0)
> Maybe this should work:
> 
> 
> import std.algorithm: reduce;
> struct Foo {
>     immutable int x;
> }
> void main() {
>     auto data = [Foo(0)];
>     reduce!((a, b) => a)(data);
> }
> 
> 
> 
> DMD 2.063alpha gives:
> 
> ...\dmd2\src\phobos\std\algorithm.d(702): Error: cannot modify struct result
> Foo with immutable members
> ...\dmd2\src\phobos\std\algorithm.d(723): Error: template instance
> test.main.reduce!(__lambda3).reduce!(Foo,Foo[]) error instantiating
> test.d(7):        instantiated from here: reduce!(Foo[])
> test.d(7): Error: template instance test.main.reduce!(__lambda3).reduce!(Foo[])
> error instantiating

I think it is acceptable to require that whatever the type being reduced be
assignable? It would be more friendly if it asserts though.

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