[Issue 23844] chain(only) doesn't support immutable structs

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23844

Dlang Bot <dlang-bot at dlang.rocks> changed:

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--- Comment #1 from Dlang Bot <dlang-bot at dlang.rocks> ---
@FeepingCreature updated dlang/phobos pull request #8736 "Fix issue 23844:
Support ranges with immutable fields (like `only` with `immutable struct`) in
`chain`." fixing this issue:

- Fix issue 23844: Support ranges with immutable fields (like `only` with
`immutable struct`) in `chain`.
  `only` is a range that may be *mutable*, but not *assignable*. `chain` falls
over here because it assumes it can make a struct with ranges, and reassign
them with new values, which isn't necessarily the case even if the ranges are
not `const`.
  Solved by creating a separate tuple of `Rebindable` ranges for this case.

https://github.com/dlang/phobos/pull/8736

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