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Description
openedon Jun 14, 2021
Currently, when a tuple pattern has a different number of fields than a tuple variant, the output is like the following:
error[E0023]: this pattern has 2 fields, but the corresponding tuple variant has 1 field
--> compiler/rustc_middle/src/ty/print/pretty.rs:634:27
|
634 | | ty::PredicateKind::ImplicitSizedTrait(pred, _) =
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected 1 field, found 2
|
::: compiler/rustc_middle/src/ty/mod.rs:440:5
|
440 | ImplicitSizedTrait(TraitPredicate<'tcx>),
| ---------------------------------------- tuple variant defined here
Ideally, the primary span would be for the individual fields, with a secondary span pointing at the pattern path. As a stretch goal, when pointing at the definition we'd point at the fields in the same way, instead of the whole variant (but this isn't absolutely necessary).
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