Function rustc_lint::middle::check_match::constructor_arityUnstable
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pub fn constructor_arity(cx: &MatchCheckCtxt, ctor: &Constructor, ty: &TyS) -> usize
This computes the arity of a constructor. The arity of a constructor is how many subpattern patterns of that constructor should be expanded to.
For instance, a tuple pattern (_, 42, Some([])) has the arity of 3. A struct pattern's arity is the number of fields it contains, etc.