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fix(builder): don't require mut for is_multiple #4704

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klnusbaum
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While pursuing an implementation for #4574, I noticed the that the is_multiple function requires a mutable reference to self. But this function is just a simple accessor. The mut requirement is onerous. Let's relax the requirement so that we don't need to have a mutable version of an ArgGroup just to check if it allows multiple arguments.

@@ -270,7 +270,7 @@ impl ArgGroup {
///
/// assert!(group.is_multiple());
/// ```
pub fn is_multiple(&mut self) -> bool {
pub fn is_multiple(&self) -> bool {
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This looks to b a breaking change as you can no longer capture the function with the old signature (example).

Options:

  • Create an issue and we can flag it for v5
  • Put this change behind the unstable-v5 feature flag

@klnusbaum
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Oh interesting. I didn't realize this would be a breaking change. My bad. I'll make an issue in a bit and we can just flag it for v5.

In the mean time, I'll just use mut where I need to.

@klnusbaum
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@epage made a new issue here #4708

@epage epage added the M-breaking-change Meta: Implementing or merging this will introduce a breaking change. label Feb 14, 2023
@epage epage added this to the 5.0 milestone Feb 14, 2023
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epage commented Feb 14, 2023

Thanks!

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