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Add mention of breaking change about [_] in generics to changelog (#21437)

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Add mention of breaking change to changelog

As described by #21435 , generic proc declarations making use of `_` as generic
parameter are no longer possible. This is a change that was introduced by 
#21192 . During the debate over if this should be part of the intended spec in
#21435 we concluded that it is and thus should be mentioned as a breaking
change in the changelogs.
This commit is contained in:
PhilippMDoerner 2023-02-26 09:57:51 +01:00 • committed by GitHub
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7
changelogs/changelog_2_0_0.md
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@ -149,6 +149,13 @@
proc foo(_, _: int): int = 123 proc foo(_, _: int): int = 123
echo foo(1, 2) echo foo(1, 2)
``` ```
- Underscores (`_`) as generic parameters are not supported and cannot be used.
Generics that use `_` as parameters will no longer compile requires you to replace `_` with something else:
```nim
proc foo[_](t: typedesc[_]): string = "BAR" # Can not compile
proc foo[T](t: typedesc[T]): string = "BAR" # Can compile
```
- - Added the `--legacy:verboseTypeMismatch` switch to get legacy type mismatch error messages. - - Added the `--legacy:verboseTypeMismatch` switch to get legacy type mismatch error messages.