diff options
3 files changed, 40 insertions, 2 deletions
diff --git a/compiler/rustc_typeck/src/check/pat.rs b/compiler/rustc_typeck/src/check/pat.rs index c16be38d5fc..1c4fbbbb9bf 100644 --- a/compiler/rustc_typeck/src/check/pat.rs +++ b/compiler/rustc_typeck/src/check/pat.rs @@ -17,7 +17,7 @@ use rustc_session::lint::builtin::NON_EXHAUSTIVE_OMITTED_PATTERNS; use rustc_span::hygiene::DesugaringKind; use rustc_span::lev_distance::find_best_match_for_name; use rustc_span::source_map::{Span, Spanned}; -use rustc_span::symbol::{sym, Ident}; +use rustc_span::symbol::{kw, sym, Ident}; use rustc_span::{BytePos, MultiSpan, DUMMY_SP}; use rustc_trait_selection::autoderef::Autoderef; use rustc_trait_selection::traits::{ObligationCause, Pattern}; @@ -1275,7 +1275,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> { .filter(|(_, ident)| !used_fields.contains_key(ident)) .collect::<Vec<_>>(); - let inexistent_fields_err = if !(inexistent_fields.is_empty() || variant.is_recovered()) { + let inexistent_fields_err = if !(inexistent_fields.is_empty() || variant.is_recovered()) + && !inexistent_fields.iter().any(|field| field.name == kw::Underscore) + { Some(self.error_inexistent_fields( adt.variant_descr(), &inexistent_fields, diff --git a/src/test/ui/structs-enums/struct-enum-ignoring-field-with-underscore.rs b/src/test/ui/structs-enums/struct-enum-ignoring-field-with-underscore.rs new file mode 100644 index 00000000000..c30b8a1e1f1 --- /dev/null +++ b/src/test/ui/structs-enums/struct-enum-ignoring-field-with-underscore.rs @@ -0,0 +1,12 @@ +enum Foo { + Bar { bar: bool }, + Other, +} + +fn main() { + let foo = Some(Foo::Other); + + if let Some(Foo::Bar {_}) = foo {} + //~^ ERROR expected identifier, found reserved identifier `_` + //~| ERROR pattern does not mention field `bar` [E0027] +} diff --git a/src/test/ui/structs-enums/struct-enum-ignoring-field-with-underscore.stderr b/src/test/ui/structs-enums/struct-enum-ignoring-field-with-underscore.stderr new file mode 100644 index 00000000000..16f751444a5 --- /dev/null +++ b/src/test/ui/structs-enums/struct-enum-ignoring-field-with-underscore.stderr @@ -0,0 +1,24 @@ +error: expected identifier, found reserved identifier `_` + --> $DIR/struct-enum-ignoring-field-with-underscore.rs:9:27 + | +LL | if let Some(Foo::Bar {_}) = foo {} + | ^ expected identifier, found reserved identifier + +error[E0027]: pattern does not mention field `bar` + --> $DIR/struct-enum-ignoring-field-with-underscore.rs:9:17 + | +LL | if let Some(Foo::Bar {_}) = foo {} + | ^^^^^^^^^^^^ missing field `bar` + | +help: include the missing field in the pattern + | +LL | if let Some(Foo::Bar {_, bar }) = foo {} + | ~~~~~~~ +help: if you don't care about this missing field, you can explicitly ignore it + | +LL | if let Some(Foo::Bar {_, .. }) = foo {} + | ~~~~~~ + +error: aborting due to 2 previous errors + +For more information about this error, try `rustc --explain E0027`. |