Bug 10408 – Two-function std.algorithm.reduce of a const array

import std.algorithm: min, max, reduce; void main() { const numbers = [10, 30, 20]; immutable m = numbers.reduce!(min); // OK immutable mm = numbers.reduce!(min, max); // error } DMD 2.063.2 gives: ...\dmd2\src\phobos\std\conv.d(3610): Error: cannot modify const expression *chunk ...\dmd2\src\phobos\std\algorithm.d(736): Error: template instance std.conv.emplace!(const(int), const(int)) error instantiating test.d(5): instantiated from here: reduce!(const(int)[]) ...\dmd2\src\phobos\std\algorithm.d(712): Error: can only initialize const member _expand_field_0 inside constructor ...\dmd2\src\phobos\std\algorithm.d(712): Error: can only initialize const member _expand_field_1 inside constructor ...\dmd2\src\phobos\std\algorithm.d(739): Error: template instance std.algorithm.reduce!(min, max).reduce!(Tuple!(const(int), const(int)), const(int)[]) error instantiating test.d(5): instantiated from here: reduce!(const(int)[]) test.d(5): Error: template instance std.algorithm.reduce!(min, max).reduce!(const(int)[]) error instantiating

Commits pushed to master at https://github.com/D-Programming-Language/phobos https://github.com/D-Programming-Language/phobos/commit/58d403a02d1fe445384ac34a965b76b3d975032e Issue 10408 - Fix compile error with multiple-function reduce on a const range. https://github.com/D-Programming-Language/phobos/commit/3f902900387a9e094e8e325c8e4a1048f577eefe Merge pull request #1361 from irritate/issue_10408 Issue 10408 - Fix compile error with multiple-function reduce on a const...