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Point at enum definition when match patterns are not exhaustive

Browse Source 
```
error[E0004]: non-exhaustive patterns: type `X` is non-empty
 --> file.rs:9:11
  |
1 | / enum X {
2 | |     A,
  | |     - variant not covered
3 | |     B,
  | |     - variant not covered
4 | |     C,
  | |     - variant not covered
5 | | }
  | |_- `X` defined here
...
9 |       match x {
  |             ^
  |
  = help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms

error[E0004]: non-exhaustive patterns: `B` and `C` not covered
  --> file.rs:11:11
   |
1  | / enum X {
2  | |     A,
3  | |     B,
4  | |     C,
   | |     - not covered
5  | | }
   | |_- `X` defined here
...
11 |       match x {
   |             ^ patterns `C` not covered
```

When a match expression doesn't have patterns covering every variant,
point at the enum's definition span. On a best effort basis, point at the
variant(s) that are missing. This does not handle the case when the missing
pattern is due to a field's enum variants:

```
enum E1 {
    A,
    B,
    C,
}
enum E2 {
    A(E1),
    B,
}
fn foo() {
    match E2::A(E1::A) {
        E2::A(E1::B) => {}
        E2::B => {}
    }
    //~^ ERROR `E2::A(E1::A)` and `E2::A(E1::C)` not handled
}
```

Unify look between match with no arms and match with some missing patterns.

Fix #37518.
This commit is contained in:
Esteban Küber 2019-02-10 05:12:00 -08:00
parent c1d2d83ca3
commit 0081ef2548
36 changed files with 390 additions and 95 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
src/librustc_mir/hair/pattern/_match.rs
View File

@ -539,7 +539,6 @@ impl<'tcx> Witness<'tcx> {
self.apply_constructor(cx, ctor, ty)
}
/// Constructs a partial witness for a pattern given a list of
/// patterns expanded by the specialization step.
///

134
src/librustc_mir/hair/pattern/check_match.rs
View File

@ -10,7 +10,7 @@ use rustc::middle::expr_use_visitor as euv;
use rustc::middle::mem_categorization::cmt_;
use rustc::middle::region;
use rustc::session::Session;
use rustc::ty::{self, Ty, TyCtxt};
use rustc::ty::{self, Ty, TyCtxt, TyKind};
use rustc::ty::subst::{InternalSubsts, SubstsRef};
use rustc::lint;
use rustc_errors::{Applicability, DiagnosticBuilder};
@ -204,25 +204,42 @@ impl<'a, 'tcx> MatchVisitor<'a, 'tcx> {
// is uninhabited.
let pat_ty = self.tables.node_type(scrut.hir_id);
let module = self.tcx.hir().get_module_parent_by_hir_id(scrut.hir_id);
let mut def_span = None;
let mut missing_variants = vec![];
if inlined_arms.is_empty() {
let scrutinee_is_uninhabited = if self.tcx.features().exhaustive_patterns {
self.tcx.is_ty_uninhabited_from(module, pat_ty)
} else {
match pat_ty.sty {
ty::Never => true,
ty::Adt(def, _) => def.variants.is_empty(),
ty::Adt(def, _) => {
def_span = self.tcx.hir().span_if_local(def.did);
if def.variants.len() < 4 && !def.variants.is_empty() {
// keep around to point at the definition of non-covered variants
missing_variants = def.variants.iter()
.map(|variant| variant.ident.span)
.collect();
}
def.variants.is_empty()
},
_ => false
}
};
if !scrutinee_is_uninhabited {
// We know the type is inhabited, so this must be wrong
let mut err = create_e0004(self.tcx.sess, scrut.span,
format!("non-exhaustive patterns: type `{}` \
is non-empty",
pat_ty));
span_help!(&mut err, scrut.span,
"ensure that all possible cases are being handled, \
possibly by adding wildcards or more match arms");
let mut err = create_e0004(self.tcx.sess, scrut.span, format!(
"non-exhaustive patterns: type `{}` is non-empty",
pat_ty,
));
err.help("ensure that all possible cases are being handled, \
possibly by adding wildcards or more match arms");
if let Some(sp) = def_span {
err.span_label(sp, format!("`{}` defined here", pat_ty));
}
// point at the definition of non-covered enum variants
for variant in &missing_variants {
err.span_label(*variant, "variant not covered");
}
err.emit();
}
// If the type *is* uninhabited, it's vacuously exhaustive
@ -264,7 +281,7 @@ impl<'a, 'tcx> MatchVisitor<'a, 'tcx> {
};
let pattern_string = witness[0].single_pattern().to_string();
let mut diag = struct_span_err!(
let mut err = struct_span_err!(
self.tcx.sess, pat.span, E0005,
"refutable pattern in {}: `{}` not covered",
origin, pattern_string
@ -277,8 +294,13 @@ impl<'a, 'tcx> MatchVisitor<'a, 'tcx> {
}
_ => format!("pattern `{}` not covered", pattern_string),
};
diag.span_label(pat.span, label_msg);
diag.emit();
err.span_label(pat.span, label_msg);
if let ty::Adt(def, _) = pattern_ty.sty {
if let Some(sp) = self.tcx.hir().span_if_local(def.did){
err.span_label(sp, format!("`{}` defined here", pattern_ty));
}
}
err.emit();
});
}
}
@ -332,10 +354,11 @@ fn pat_is_catchall(pat: &Pat) -> bool {
}
// Check for unreachable patterns
fn check_arms<'a, 'tcx>(cx: &mut MatchCheckCtxt<'a, 'tcx>,
arms: &[(Vec<(&'a Pattern<'tcx>, &hir::Pat)>, Option<&hir::Expr>)],
source: hir::MatchSource)
{
fn check_arms<'a, 'tcx>(
cx: &mut MatchCheckCtxt<'a, 'tcx>,
arms: &[(Vec<(&'a Pattern<'tcx>, &hir::Pat)>, Option<&hir::Expr>)],
source: hir::MatchSource,
) {
let mut seen = Matrix::empty();
let mut catchall = None;
for (arm_index, &(ref pats, guard)) in arms.iter().enumerate() {
@ -411,10 +434,12 @@ fn check_arms<'a, 'tcx>(cx: &mut MatchCheckCtxt<'a, 'tcx>,
}
}
fn check_exhaustive<'p, 'a: 'p, 'tcx: 'a>(cx: &mut MatchCheckCtxt<'a, 'tcx>,
scrut_ty: Ty<'tcx>,
sp: Span,
matrix: &Matrix<'p, 'tcx>) {
fn check_exhaustive<'p, 'a: 'p, 'tcx: 'a>(
cx: &mut MatchCheckCtxt<'a, 'tcx>,
scrut_ty: Ty<'tcx>,
sp: Span,
matrix: &Matrix<'p, 'tcx>,
) {
let wild_pattern = Pattern {
ty: scrut_ty,
span: DUMMY_SP,
@ -448,11 +473,26 @@ fn check_exhaustive<'p, 'a: 'p, 'tcx: 'a>(cx: &mut MatchCheckCtxt<'a, 'tcx>,
1 => format!("pattern {} not covered", joined_patterns),
_ => format!("patterns {} not covered", joined_patterns),
};
create_e0004(cx.tcx.sess, sp,
format!("non-exhaustive patterns: {} not covered",
joined_patterns))
.span_label(sp, label_text)
.emit();
let mut err = create_e0004(cx.tcx.sess, sp, format!(
"non-exhaustive patterns: {} not covered",
joined_patterns,
));
err.span_label(sp, label_text);
// point at the definition of non-covered enum variants
if let ty::Adt(def, _) = scrut_ty.sty {
if let Some(sp) = cx.tcx.hir().span_if_local(def.did){
err.span_label(sp, format!("`{}` defined here", scrut_ty));
}
}
let patterns = witnesses.iter().map(|p| (**p).clone()).collect::<Vec<Pattern>>();
if patterns.len() < 4 {
for sp in maybe_point_at_variant(cx, &scrut_ty.sty, patterns.as_slice()) {
err.span_label(sp, "not covered");
}
}
err.help("ensure that all possible cases are being handled, \
possibly by adding wildcards or more match arms");
err.emit();
}
NotUseful => {
// This is good, wildcard pattern isn't reachable
@ -461,10 +501,48 @@ fn check_exhaustive<'p, 'a: 'p, 'tcx: 'a>(cx: &mut MatchCheckCtxt<'a, 'tcx>,
}
}
fn maybe_point_at_variant(
cx: &mut MatchCheckCtxt<'a, 'tcx>,
sty: &TyKind<'tcx>,
patterns: &[Pattern],
) -> Vec<Span> {
let mut covered = vec![];
if let ty::Adt(def, _) = sty {
// Don't point at the variants if they are too many to avoid visual clutter
for pattern in patterns {
let pk: &PatternKind = &pattern.kind;
if let PatternKind::Variant { adt_def, variant_index, subpatterns, .. } = pk {
if adt_def.did == def.did {
let sp = def.variants[*variant_index].ident.span;
if covered.contains(&sp) {
continue;
}
covered.push(sp);
let subpatterns = subpatterns.iter()
.map(|field_pattern| field_pattern.pattern.clone())
.collect::<Vec<_>>();
covered.extend(
maybe_point_at_variant(cx, sty, subpatterns.as_slice()),
);
}
}
if let PatternKind::Leaf{ subpatterns } = pk {
let subpatterns = subpatterns.iter()
.map(|field_pattern| field_pattern.pattern.clone())
.collect::<Vec<_>>();
covered.extend(maybe_point_at_variant(cx, sty, subpatterns.as_slice()));
}
}
}
covered
}
// Legality of move bindings checking
fn check_legality_of_move_bindings(cx: &MatchVisitor<'_, '_>,
has_guard: bool,
pats: &[P<Pat>]) {
fn check_legality_of_move_bindings(
cx: &MatchVisitor<'_, '_>,
has_guard: bool,
pats: &[P<Pat>],
) {
let mut by_ref_span = None;
for pat in pats {
pat.each_binding(|_, hir_id, span, _path| {

12
src/test/ui/always-inhabited-union-ref.stderr
View File

@ -4,11 +4,7 @@ error[E0004]: non-exhaustive patterns: type `&'static !` is non-empty
LL | match uninhab_ref() {
| ^^^^^^^^^^^^^
|
help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
--> $DIR/always-inhabited-union-ref.rs:23:11
|
LL | match uninhab_ref() {
| ^^^^^^^^^^^^^
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: type `Foo` is non-empty
--> $DIR/always-inhabited-union-ref.rs:27:11
@ -16,11 +12,7 @@ error[E0004]: non-exhaustive patterns: type `Foo` is non-empty
LL | match uninhab_union() {
| ^^^^^^^^^^^^^^^
|
help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
--> $DIR/always-inhabited-union-ref.rs:27:11
|
LL | match uninhab_union() {
| ^^^^^^^^^^^^^^^
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to 2 previous errors

22
src/test/ui/check_match/issue-35609.stderr
View File

@ -3,48 +3,70 @@ error[E0004]: non-exhaustive patterns: `(B, _)`, `(C, _)`, `(D, _)` and 2 more n
|
LL | match (A, ()) { //~ ERROR non-exhaustive
| ^^^^^^^ patterns `(B, _)`, `(C, _)`, `(D, _)` and 2 more not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `(_, B)`, `(_, C)`, `(_, D)` and 2 more not covered
--> $DIR/issue-35609.rs:14:11
|
LL | match (A, A) { //~ ERROR non-exhaustive
| ^^^^^^ patterns `(_, B)`, `(_, C)`, `(_, D)` and 2 more not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `((B, _), _)`, `((C, _), _)`, `((D, _), _)` and 2 more not covered
--> $DIR/issue-35609.rs:18:11
|
LL | match ((A, ()), ()) { //~ ERROR non-exhaustive
| ^^^^^^^^^^^^^ patterns `((B, _), _)`, `((C, _), _)`, `((D, _), _)` and 2 more not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `((B, _), _)`, `((C, _), _)`, `((D, _), _)` and 2 more not covered
--> $DIR/issue-35609.rs:22:11
|
LL | match ((A, ()), A) { //~ ERROR non-exhaustive
| ^^^^^^^^^^^^ patterns `((B, _), _)`, `((C, _), _)`, `((D, _), _)` and 2 more not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `((B, _), _)`, `((C, _), _)`, `((D, _), _)` and 2 more not covered
--> $DIR/issue-35609.rs:26:11
|
LL | match ((A, ()), ()) { //~ ERROR non-exhaustive
| ^^^^^^^^^^^^^ patterns `((B, _), _)`, `((C, _), _)`, `((D, _), _)` and 2 more not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `S(B, _)`, `S(C, _)`, `S(D, _)` and 2 more not covered
--> $DIR/issue-35609.rs:31:11
|
LL | struct S(Enum, ());
| ------------------- `S` defined here
...
LL | match S(A, ()) { //~ ERROR non-exhaustive
| ^^^^^^^^ patterns `S(B, _)`, `S(C, _)`, `S(D, _)` and 2 more not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `Sd { x: B, .. }`, `Sd { x: C, .. }`, `Sd { x: D, .. }` and 2 more not covered
--> $DIR/issue-35609.rs:35:11
|
LL | struct Sd { x: Enum, y: () }
| ---------------------------- `Sd` defined here
...
LL | match (Sd { x: A, y: () }) { //~ ERROR non-exhaustive
| ^^^^^^^^^^^^^^^^^^^^ patterns `Sd { x: B, .. }`, `Sd { x: C, .. }`, `Sd { x: D, .. }` and 2 more not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `Some(B)`, `Some(C)`, `Some(D)` and 2 more not covered
--> $DIR/issue-35609.rs:39:11
|
LL | match Some(A) { //~ ERROR non-exhaustive
| ^^^^^^^ patterns `Some(B)`, `Some(C)`, `Some(D)` and 2 more not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to 8 previous errors

2
src/test/ui/consts/match_ice.stderr
View File

@ -3,6 +3,8 @@ error[E0004]: non-exhaustive patterns: `&S` not covered
|
LL | match C { //~ ERROR non-exhaustive
| ^ pattern `&S` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to previous error

11
src/test/ui/empty/empty-never-array.stderr
View File

@ -1,8 +1,15 @@
error[E0005]: refutable pattern in local binding: `T(_, _)` not covered
--> $DIR/empty-never-array.rs:10:9
|
LL | let Helper::U(u) = Helper::T(t, []);
| ^^^^^^^^^^^^ pattern `T(_, _)` not covered
LL | / enum Helper<T, U> {
LL | | T(T, [!; 0]),
LL | | #[allow(dead_code)]
LL | | U(U),
LL | | }
| |_- `Helper<T, U>` defined here
...
LL | let Helper::U(u) = Helper::T(t, []);
| ^^^^^^^^^^^^ pattern `T(_, _)` not covered
error: aborting due to previous error

6
src/test/ui/error-codes/E0004-2.stderr
View File

@ -4,11 +4,7 @@ error[E0004]: non-exhaustive patterns: type `std::option::Option<i32>` is non-em
LL | match x { } //~ ERROR E0004
| ^
|
help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
--> $DIR/E0004-2.rs:4:11
|
LL | match x { } //~ ERROR E0004
| ^
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to previous error

13
src/test/ui/error-codes/E0004.stderr
View File

@ -1,8 +1,17 @@
error[E0004]: non-exhaustive patterns: `HastaLaVistaBaby` not covered
--> $DIR/E0004.rs:9:11
|
LL | match x { //~ ERROR E0004
| ^ pattern `HastaLaVistaBaby` not covered
LL | / enum Terminator {
LL | | HastaLaVistaBaby,
| | ---------------- not covered
LL | | TalkToMyHand,
LL | | }
| |_- `Terminator` defined here
...
LL | match x { //~ ERROR E0004
| ^ pattern `HastaLaVistaBaby` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to previous error

22
src/test/ui/exhaustive_integer_patterns.stderr
View File

@ -15,12 +15,16 @@ error[E0004]: non-exhaustive patterns: `128u8..=255u8` not covered
|
LL | match x { //~ ERROR non-exhaustive patterns
| ^ pattern `128u8..=255u8` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `11u8..=19u8`, `31u8..=34u8`, `36u8..=69u8` and 1 more not covered
--> $DIR/exhaustive_integer_patterns.rs:33:11
|
LL | match x { //~ ERROR non-exhaustive patterns
| ^ patterns `11u8..=19u8`, `31u8..=34u8`, `36u8..=69u8` and 1 more not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: unreachable pattern
--> $DIR/exhaustive_integer_patterns.rs:44:9
@ -33,54 +37,72 @@ error[E0004]: non-exhaustive patterns: `-128i8..=-8i8`, `-6i8`, `121i8..=124i8`
|
LL | match x { //~ ERROR non-exhaustive patterns
| ^ patterns `-128i8..=-8i8`, `-6i8`, `121i8..=124i8` and 1 more not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `-128i8` not covered
--> $DIR/exhaustive_integer_patterns.rs:82:11
|
LL | match 0i8 { //~ ERROR non-exhaustive patterns
| ^^^ pattern `-128i8` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `0i16` not covered
--> $DIR/exhaustive_integer_patterns.rs:90:11
|
LL | match 0i16 { //~ ERROR non-exhaustive patterns
| ^^^^ pattern `0i16` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `128u8..=255u8` not covered
--> $DIR/exhaustive_integer_patterns.rs:108:11
|
LL | match 0u8 { //~ ERROR non-exhaustive patterns
| ^^^ pattern `128u8..=255u8` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `(0u8, Some(_))` and `(2u8..=255u8, Some(_))` not covered
--> $DIR/exhaustive_integer_patterns.rs:120:11
|
LL | match (0u8, Some(())) { //~ ERROR non-exhaustive patterns
| ^^^^^^^^^^^^^^^ patterns `(0u8, Some(_))` and `(2u8..=255u8, Some(_))` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `(126u8..=127u8, false)` not covered
--> $DIR/exhaustive_integer_patterns.rs:125:11
|
LL | match (0u8, true) { //~ ERROR non-exhaustive patterns
| ^^^^^^^^^^^ pattern `(126u8..=127u8, false)` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `340282366920938463463374607431768211455u128` not covered
--> $DIR/exhaustive_integer_patterns.rs:145:11
|
LL | match 0u128 { //~ ERROR non-exhaustive patterns
| ^^^^^ pattern `340282366920938463463374607431768211455u128` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `5u128..=340282366920938463463374607431768211455u128` not covered
--> $DIR/exhaustive_integer_patterns.rs:149:11
|
LL | match 0u128 { //~ ERROR non-exhaustive patterns
| ^^^^^ pattern `5u128..=340282366920938463463374607431768211455u128` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `0u128..=3u128` not covered
--> $DIR/exhaustive_integer_patterns.rs:153:11
|
LL | match 0u128 { //~ ERROR non-exhaustive patterns
| ^^^^^ pattern `0u128..=3u128` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to 13 previous errors

4
src/test/ui/feature-gates/feature-gate-precise_pointer_size_matching.stderr
View File

@ -3,12 +3,16 @@ error[E0004]: non-exhaustive patterns: `_` not covered
|
LL | match 0usize { //~ERROR non-exhaustive patterns: `_` not covered
| ^^^^^^ pattern `_` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `_` not covered
--> $DIR/feature-gate-precise_pointer_size_matching.rs:10:11
|
LL | match 0isize { //~ERROR non-exhaustive patterns: `_` not covered
| ^^^^^^ pattern `_` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to 2 previous errors

2
src/test/ui/issues/issue-15129.stderr
View File

@ -3,6 +3,8 @@ error[E0004]: non-exhaustive patterns: `(T1(()), V2(_))` not covered
|
LL | match (T::T1(()), V::V2(true)) {
| ^^^^^^^^^^^^^^^^^^^^^^^^ pattern `(T1(()), V2(_))` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to previous error

2
src/test/ui/issues/issue-2111.stderr
View File

@ -3,6 +3,8 @@ error[E0004]: non-exhaustive patterns: `(None, None)` not covered
|
LL | match (a,b) {
| ^^^^^ pattern `(None, None)` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to previous error

4
src/test/ui/issues/issue-30240.stderr
View File

@ -3,12 +3,16 @@ error[E0004]: non-exhaustive patterns: `&_` not covered
|
LL | match "world" { //~ ERROR non-exhaustive patterns: `&_`
| ^^^^^^^ pattern `&_` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `&_` not covered
--> $DIR/issue-30240.rs:6:11
|
LL | match "world" { //~ ERROR non-exhaustive patterns: `&_`
| ^^^^^^^ pattern `&_` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to 2 previous errors

6
src/test/ui/issues/issue-3096-1.stderr
View File

@ -4,11 +4,7 @@ error[E0004]: non-exhaustive patterns: type `()` is non-empty
LL | match () { } //~ ERROR non-exhaustive
| ^^
|
help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
--> $DIR/issue-3096-1.rs:2:11
|
LL | match () { } //~ ERROR non-exhaustive
| ^^
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to previous error

6
src/test/ui/issues/issue-3096-2.stderr
View File

@ -4,11 +4,7 @@ error[E0004]: non-exhaustive patterns: type `*const Bottom` is non-empty
LL | match x { } //~ ERROR non-exhaustive patterns
| ^
|
help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
--> $DIR/issue-3096-2.rs:5:11
|
LL | match x { } //~ ERROR non-exhaustive patterns
| ^
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to previous error

11
src/test/ui/issues/issue-31561.stderr
View File

@ -1,8 +1,15 @@
error[E0005]: refutable pattern in local binding: `Bar` not covered
--> $DIR/issue-31561.rs:8:9
|
LL | let Thing::Foo(y) = Thing::Foo(1);
| ^^^^^^^^^^^^^ pattern `Bar` not covered
LL | / enum Thing {
LL | | Foo(u8),
LL | | Bar,
LL | | Baz
LL | | }
| |_- `Thing` defined here
...
LL | let Thing::Foo(y) = Thing::Foo(1);
| ^^^^^^^^^^^^^ pattern `Bar` not covered
error: aborting due to previous error

2
src/test/ui/issues/issue-3601.stderr
View File

@ -3,6 +3,8 @@ error[E0004]: non-exhaustive patterns: `_` not covered
|
LL | box NodeKind::Element(ed) => match ed.kind { //~ ERROR non-exhaustive patterns
| ^^^^^^^ pattern `_` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to previous error

11
src/test/ui/issues/issue-39362.stderr
View File

@ -1,8 +1,15 @@
error[E0004]: non-exhaustive patterns: `Bar { bar: C, .. }`, `Bar { bar: D, .. }`, `Bar { bar: E, .. }` and 1 more not covered
--> $DIR/issue-39362.rs:10:11
|
LL | match f {
| ^ patterns `Bar { bar: C, .. }`, `Bar { bar: D, .. }`, `Bar { bar: E, .. }` and 1 more not covered
LL | / enum Foo {
LL | | Bar { bar: Bar, id: usize }
LL | | }
| |_- `Foo` defined here
...
LL | match f {
| ^ patterns `Bar { bar: C, .. }`, `Bar { bar: D, .. }`, `Bar { bar: E, .. }` and 1 more not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to previous error

2
src/test/ui/issues/issue-4321.stderr
View File

@ -3,6 +3,8 @@ error[E0004]: non-exhaustive patterns: `(true, false)` not covered
|
LL | println!("foo {:}", match tup { //~ ERROR non-exhaustive patterns: `(true, false)` not covered
| ^^^ pattern `(true, false)` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to previous error

16
src/test/ui/match/match-argm-statics-2.stderr
View File

@ -3,18 +3,30 @@ error[E0004]: non-exhaustive patterns: `(true, false)` not covered
|
LL | match (true, false) {
| ^^^^^^^^^^^^^ pattern `(true, false)` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `Some(Some(West))` not covered
--> $DIR/match-argm-statics-2.rs:29:11
|
LL | match Some(Some(North)) {
| ^^^^^^^^^^^^^^^^^ pattern `Some(Some(West))` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `Foo { bar: Some(North), baz: NewBool(true) }` not covered
--> $DIR/match-argm-statics-2.rs:48:11
|
LL | match (Foo { bar: Some(North), baz: NewBool(true) }) {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ pattern `Foo { bar: Some(North), baz: NewBool(true) }` not covered
LL | / struct Foo {
LL | | bar: Option<Direction>,
LL | | baz: NewBool
LL | | }
| |_- `Foo` defined here
...
LL | match (Foo { bar: Some(North), baz: NewBool(true) }) {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ pattern `Foo { bar: Some(North), baz: NewBool(true) }` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to 3 previous errors

4
src/test/ui/match/match-byte-array-patterns-2.stderr
View File

@ -3,12 +3,16 @@ error[E0004]: non-exhaustive patterns: `&[_, _, _, _]` not covered
|
LL | match buf { //~ ERROR non-exhaustive
| ^^^ pattern `&[_, _, _, _]` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `&[]`, `&[_]`, `&[_, _]` and 3 more not covered
--> $DIR/match-byte-array-patterns-2.rs:10:11
|
LL | match buf { //~ ERROR non-exhaustive
| ^^^ patterns `&[]`, `&[_]`, `&[_, _]` and 3 more not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to 2 previous errors

4
src/test/ui/match/match-non-exhaustive.stderr
View File

@ -3,12 +3,16 @@ error[E0004]: non-exhaustive patterns: `-2147483648i32..=0i32` and `2i32..=21474
|
LL | match 0 { 1 => () } //~ ERROR non-exhaustive patterns
| ^ patterns `-2147483648i32..=0i32` and `2i32..=2147483647i32` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `_` not covered
--> $DIR/match-non-exhaustive.rs:3:11
|
LL | match 0 { 0 if false => () } //~ ERROR non-exhaustive patterns
| ^ pattern `_` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to 2 previous errors

2
src/test/ui/match/match-privately-empty.stderr
View File

@ -3,6 +3,8 @@ error[E0004]: non-exhaustive patterns: `Some(Private { misc: true, .. })` not co
|
LL | match private::DATA {
| ^^^^^^^^^^^^^ pattern `Some(Private { misc: true, .. })` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to previous error

2
src/test/ui/match/match-slice-patterns.stderr
View File

@ -3,6 +3,8 @@ error[E0004]: non-exhaustive patterns: `&[_, Some(_), None, _]` not covered
|
LL | match list {
| ^^^^ pattern `&[_, Some(_), None, _]` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to previous error

12
src/test/ui/missing/missing-items/issue-40221.stderr
View File

@ -1,8 +1,16 @@
error[E0004]: non-exhaustive patterns: `C(QA)` not covered
--> $DIR/issue-40221.rs:11:11
|
LL | match proto { //~ ERROR non-exhaustive patterns
| ^^^^^ pattern `C(QA)` not covered
LL | / enum P {
LL | | C(PC),
| | - not covered
LL | | }
| |_- `P` defined here
...
LL | match proto { //~ ERROR non-exhaustive patterns
| ^^^^^ pattern `C(QA)` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to previous error

2
src/test/ui/non-exhaustive/non-exhaustive-float-range-match.stderr
View File

@ -3,6 +3,8 @@ error[E0004]: non-exhaustive patterns: `_` not covered
|
LL | match 0.0 { //~ ERROR non-exhaustive patterns
| ^^^ pattern `_` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to previous error

10
src/test/ui/non-exhaustive/non-exhaustive-match-nested.stderr
View File

@ -3,12 +3,22 @@ error[E0004]: non-exhaustive patterns: `(Some(&[]), Err(_))` not covered
|
LL | match (l1, l2) { //~ ERROR non-exhaustive patterns: `(Some(&[]), Err(_))` not covered
| ^^^^^^^^ pattern `(Some(&[]), Err(_))` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `A(C)` not covered
--> $DIR/non-exhaustive-match-nested.rs:17:11
|
LL | enum T { A(U), B }
| ------------------
| | |
| | not covered
| `T` defined here
...
LL | match x { //~ ERROR non-exhaustive patterns: `A(C)` not covered
| ^ pattern `A(C)` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to 2 previous errors

28
src/test/ui/non-exhaustive/non-exhaustive-match.stderr
View File

@ -1,50 +1,78 @@
error[E0004]: non-exhaustive patterns: `A` not covered
--> $DIR/non-exhaustive-match.rs:8:11
|
LL | enum T { A, B }
| ---------------
| | |
| | not covered
| `T` defined here
...
LL | match x { T::B => { } } //~ ERROR non-exhaustive patterns: `A` not covered
| ^ pattern `A` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `false` not covered
--> $DIR/non-exhaustive-match.rs:9:11
|
LL | match true { //~ ERROR non-exhaustive patterns: `false` not covered
| ^^^^ pattern `false` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `Some(_)` not covered
--> $DIR/non-exhaustive-match.rs:12:11
|
LL | match Some(10) { //~ ERROR non-exhaustive patterns: `Some(_)` not covered
| ^^^^^^^^ pattern `Some(_)` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `(_, _, -2147483648i32..=3i32)` and `(_, _, 5i32..=2147483647i32)` not covered
--> $DIR/non-exhaustive-match.rs:15:11
|
LL | match (2, 3, 4) { //~ ERROR non-exhaustive patterns: `(_, _, -2147483648i32..=3i32)`
| ^^^^^^^^^ patterns `(_, _, -2147483648i32..=3i32)` and `(_, _, 5i32..=2147483647i32)` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `(A, A)` not covered
--> $DIR/non-exhaustive-match.rs:19:11
|
LL | match (T::A, T::A) { //~ ERROR non-exhaustive patterns: `(A, A)` not covered
| ^^^^^^^^^^^^ pattern `(A, A)` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `B` not covered
--> $DIR/non-exhaustive-match.rs:23:11
|
LL | enum T { A, B }
| ---------------
| | |
| | not covered
| `T` defined here
...
LL | match T::A { //~ ERROR non-exhaustive patterns: `B` not covered
| ^^^^ pattern `B` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `[]` not covered
--> $DIR/non-exhaustive-match.rs:34:11
|
LL | match *vec { //~ ERROR non-exhaustive patterns: `[]` not covered
| ^^^^ pattern `[]` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `[_, _, _, _]` not covered
--> $DIR/non-exhaustive-match.rs:47:11
|
LL | match *vec { //~ ERROR non-exhaustive patterns: `[_, _, _, _]` not covered
| ^^^^ pattern `[_, _, _, _]` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to 8 previous errors

70
src/test/ui/non-exhaustive/non-exhaustive-pattern-witness.stderr
View File

@ -1,44 +1,94 @@
error[E0004]: non-exhaustive patterns: `Foo { first: false, second: Some([_, _, _, _]) }` not covered
--> $DIR/non-exhaustive-pattern-witness.rs:9:11
|
LL | match (Foo { first: true, second: None }) {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ pattern `Foo { first: false, second: Some([_, _, _, _]) }` not covered
LL | / struct Foo {
LL | | first: bool,
LL | | second: Option<[usize; 4]>
LL | | }
| |_- `Foo` defined here
...
LL | match (Foo { first: true, second: None }) {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ pattern `Foo { first: false, second: Some([_, _, _, _]) }` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `Red` not covered
--> $DIR/non-exhaustive-pattern-witness.rs:25:11
|
LL | match Color::Red {
| ^^^^^^^^^^ pattern `Red` not covered
LL | / enum Color {
LL | | Red,
| | --- not covered
LL | | Green,
LL | | CustomRGBA { a: bool, r: u8, g: u8, b: u8 }
LL | | }
| |_- `Color` defined here
...
LL | match Color::Red {
| ^^^^^^^^^^ pattern `Red` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `East`, `South` and `West` not covered
--> $DIR/non-exhaustive-pattern-witness.rs:37:11
|
LL | match Direction::North {
| ^^^^^^^^^^^^^^^^ patterns `East`, `South` and `West` not covered
LL | / enum Direction {
LL | | North, East, South, West
| | ---- ----- ---- not covered
| | | |
| | | not covered
| | not covered
LL | | }
| |_- `Direction` defined here
...
LL | match Direction::North {
| ^^^^^^^^^^^^^^^^ patterns `East`, `South` and `West` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `Second`, `Third`, `Fourth` and 8 more not covered
--> $DIR/non-exhaustive-pattern-witness.rs:48:11
|
LL | match ExcessiveEnum::First {
| ^^^^^^^^^^^^^^^^^^^^ patterns `Second`, `Third`, `Fourth` and 8 more not covered
LL | / enum ExcessiveEnum {
LL | | First, Second, Third, Fourth, Fifth, Sixth, Seventh, Eighth, Ninth, Tenth, Eleventh, Twelfth
LL | | }
| |_- `ExcessiveEnum` defined here
...
LL | match ExcessiveEnum::First {
| ^^^^^^^^^^^^^^^^^^^^ patterns `Second`, `Third`, `Fourth` and 8 more not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `CustomRGBA { a: true, .. }` not covered
--> $DIR/non-exhaustive-pattern-witness.rs:56:11
|
LL | match Color::Red {
| ^^^^^^^^^^ pattern `CustomRGBA { a: true, .. }` not covered
LL | / enum Color {
LL | | Red,
LL | | Green,
LL | | CustomRGBA { a: bool, r: u8, g: u8, b: u8 }
| | ---------- not covered
LL | | }
| |_- `Color` defined here
...
LL | match Color::Red {
| ^^^^^^^^^^ pattern `CustomRGBA { a: true, .. }` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `[Second(true), Second(false)]` not covered
--> $DIR/non-exhaustive-pattern-witness.rs:72:11
|
LL | match *x {
| ^^ pattern `[Second(true), Second(false)]` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `((), false)` not covered
--> $DIR/non-exhaustive-pattern-witness.rs:85:11
|
LL | match ((), false) {
| ^^^^^^^^^^^ pattern `((), false)` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to 7 previous errors

4
src/test/ui/precise_pointer_size_matching.stderr
View File

@ -3,12 +3,16 @@ error[E0004]: non-exhaustive patterns: `$ISIZE_MIN..=-6isize` and `21isize..=$IS
|
LL | match 0isize { //~ ERROR non-exhaustive patterns
| ^^^^^^ patterns `$ISIZE_MIN..=-6isize` and `21isize..=$ISIZE_MAX` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `0usize` and `21usize..=$USIZE_MAX` not covered
--> $DIR/precise_pointer_size_matching.rs:29:11
|
LL | match 0usize { //~ ERROR non-exhaustive patterns
| ^^^^^^ patterns `0usize` and `21usize..=$USIZE_MAX` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to 2 previous errors

2
src/test/ui/rfc-2005-default-binding-mode/slice.stderr
View File

@ -3,6 +3,8 @@ error[E0004]: non-exhaustive patterns: `&[]` not covered
|
LL | match sl { //~ ERROR non-exhaustive patterns
| ^^ pattern `&[]` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to previous error

2
src/test/ui/rfc-2008-non-exhaustive/enum.stderr
View File

@ -3,6 +3,8 @@ error[E0004]: non-exhaustive patterns: `_` not covered
|
LL | match enum_unit {
| ^^^^^^^^^ pattern `_` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to previous error

13
src/test/ui/structs/struct-like-enum-nonexhaustive.stderr
View File

@ -1,8 +1,17 @@
error[E0004]: non-exhaustive patterns: `B { x: Some(_) }` not covered
--> $DIR/struct-like-enum-nonexhaustive.rs:8:11
|
LL | match x { //~ ERROR non-exhaustive patterns
| ^ pattern `B { x: Some(_) }` not covered
LL | / enum A {
LL | | B { x: Option<isize> },
| | - not covered
LL | | C
LL | | }
| |_- `A` defined here
...
LL | match x { //~ ERROR non-exhaustive patterns
| ^ pattern `B { x: Some(_) }` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to previous error

5
src/test/ui/tuple/tuple-struct-nonexhaustive.stderr
View File

@ -1,8 +1,13 @@
error[E0004]: non-exhaustive patterns: `Foo(_, _)` not covered
--> $DIR/tuple-struct-nonexhaustive.rs:5:11
|
LL | struct Foo(isize, isize);
| ------------------------- `Foo` defined here
...
LL | match x { //~ ERROR non-exhaustive
| ^ pattern `Foo(_, _)` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error: aborting due to previous error

12
src/test/ui/uninhabited/uninhabited-irrefutable.stderr
View File

@ -1,8 +1,16 @@
error[E0005]: refutable pattern in local binding: `A(_)` not covered
--> $DIR/uninhabited-irrefutable.rs:27:9
|
LL | let Foo::D(_y) = x; //~ ERROR refutable pattern in local binding: `A(_)` not covered
| ^^^^^^^^^^ pattern `A(_)` not covered
LL | / enum Foo {
LL | | A(foo::SecretlyEmpty),
LL | | B(foo::NotSoSecretlyEmpty),
LL | | C(NotSoSecretlyEmpty),
LL | | D(u32),
LL | | }
| |_- `Foo` defined here
...
LL | let Foo::D(_y) = x; //~ ERROR refutable pattern in local binding: `A(_)` not covered
| ^^^^^^^^^^ pattern `A(_)` not covered
error: aborting due to previous error

24
src/test/ui/uninhabited/uninhabited-matches-feature-gated.stderr
View File

@ -3,6 +3,8 @@ error[E0004]: non-exhaustive patterns: `Err(_)` not covered
|
LL | let _ = match x { //~ ERROR non-exhaustive
| ^ pattern `Err(_)` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: type `&Void` is non-empty
--> $DIR/uninhabited-matches-feature-gated.rs:10:19
@ -10,11 +12,7 @@ error[E0004]: non-exhaustive patterns: type `&Void` is non-empty
LL | let _ = match x {}; //~ ERROR non-exhaustive
| ^
|
help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
--> $DIR/uninhabited-matches-feature-gated.rs:10:19
|
LL | let _ = match x {}; //~ ERROR non-exhaustive
| ^
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: type `(Void,)` is non-empty
--> $DIR/uninhabited-matches-feature-gated.rs:13:19
@ -22,11 +20,7 @@ error[E0004]: non-exhaustive patterns: type `(Void,)` is non-empty
LL | let _ = match x {}; //~ ERROR non-exhaustive
| ^
|
help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
--> $DIR/uninhabited-matches-feature-gated.rs:13:19
|
LL | let _ = match x {}; //~ ERROR non-exhaustive
| ^
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: type `[Void; 1]` is non-empty
--> $DIR/uninhabited-matches-feature-gated.rs:16:19
@ -34,23 +28,23 @@ error[E0004]: non-exhaustive patterns: type `[Void; 1]` is non-empty
LL | let _ = match x {}; //~ ERROR non-exhaustive
| ^
|
help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
--> $DIR/uninhabited-matches-feature-gated.rs:16:19
|
LL | let _ = match x {}; //~ ERROR non-exhaustive
| ^
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `&[_]` not covered
--> $DIR/uninhabited-matches-feature-gated.rs:19:19
|
LL | let _ = match x { //~ ERROR non-exhaustive
| ^ pattern `&[_]` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0004]: non-exhaustive patterns: `Err(_)` not covered
--> $DIR/uninhabited-matches-feature-gated.rs:27:19
|
LL | let _ = match x { //~ ERROR non-exhaustive
| ^ pattern `Err(_)` not covered
|
= help: ensure that all possible cases are being handled, possibly by adding wildcards or more match arms
error[E0005]: refutable pattern in local binding: `Err(_)` not covered
--> $DIR/uninhabited-matches-feature-gated.rs:32:9