Bail out of MIR construction if `check_match` fails

2 files changed, 136 insertions, 0 deletions

diff --git a/tests/ui/closures/2229_closure_analysis/bad-pattern.rs b/tests/ui/closures/2229_closure_analysis/bad-pattern.rs
new file mode 100644
index 00000000000..a7bf9b67d45
--- /dev/null
+++ b/tests/ui/closures/2229_closure_analysis/bad-pattern.rs
@@ -0,0 +1,23 @@
+// regression test for #108683
+// edition:2021
+
+enum Refutable {
+    A,
+    B,
+}
+
+fn example(v1: u32, v2: [u32; 4], v3: Refutable) {
+    const PAT: u32 = 0;
+    let v4 = &v2[..];
+    || {
+        let 0 = v1; //~ ERROR refutable pattern in local binding
+        let (0 | 1) = v1; //~ ERROR refutable pattern in local binding
+        let 1.. = v1; //~ ERROR refutable pattern in local binding
+        let [0, 0, 0, 0] = v2; //~ ERROR refutable pattern in local binding
+        let [0] = v4; //~ ERROR refutable pattern in local binding
+        let Refutable::A = v3; //~ ERROR refutable pattern in local binding
+        let PAT = v1; //~ ERROR refutable pattern in local binding
+    };
+}
+
+fn main() {}
diff --git a/tests/ui/closures/2229_closure_analysis/bad-pattern.stderr b/tests/ui/closures/2229_closure_analysis/bad-pattern.stderr
new file mode 100644
index 00000000000..ca8c2a16d32
--- /dev/null
+++ b/tests/ui/closures/2229_closure_analysis/bad-pattern.stderr
@@ -0,0 +1,113 @@
+error[E0005]: refutable pattern in local binding
+  --> $DIR/bad-pattern.rs:13:13
+   |
+LL |         let 0 = v1;
+   |             ^ pattern `1_u32..=u32::MAX` not covered
+   |
+   = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
+   = note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
+   = note: the matched value is of type `u32`
+help: you might want to use `if let` to ignore the variant that isn't matched
+   |
+LL |         if let 0 = v1 { todo!() };
+   |         ++            +++++++++++
+help: alternatively, you could prepend the pattern with an underscore to define a new named variable; identifiers cannot begin with digits
+   |
+LL |         let _0 = v1;
+   |             +
+
+error[E0005]: refutable pattern in local binding
+  --> $DIR/bad-pattern.rs:14:14
+   |
+LL |         let (0 | 1) = v1;
+   |              ^^^^^ pattern `2_u32..=u32::MAX` not covered
+   |
+   = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
+   = note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
+   = note: the matched value is of type `u32`
+help: you might want to use `if let` to ignore the variant that isn't matched
+   |
+LL |         if let (0 | 1) = v1 { todo!() };
+   |         ++                  +++++++++++
+
+error[E0005]: refutable pattern in local binding
+  --> $DIR/bad-pattern.rs:15:13
+   |
+LL |         let 1.. = v1;
+   |             ^^^ pattern `0_u32` not covered
+   |
+   = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
+   = note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
+   = note: the matched value is of type `u32`
+help: you might want to use `if let` to ignore the variant that isn't matched
+   |
+LL |         if let 1.. = v1 { todo!() };
+   |         ++              +++++++++++
+
+error[E0005]: refutable pattern in local binding
+  --> $DIR/bad-pattern.rs:16:13
+   |
+LL |         let [0, 0, 0, 0] = v2;
+   |             ^^^^^^^^^^^^ pattern `[1_u32..=u32::MAX, _, _, _]` not covered
+   |
+   = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
+   = note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
+   = note: the matched value is of type `[u32; 4]`
+help: you might want to use `if let` to ignore the variant that isn't matched
+   |
+LL |         if let [0, 0, 0, 0] = v2 { todo!() };
+   |         ++                       +++++++++++
+
+error[E0005]: refutable pattern in local binding
+  --> $DIR/bad-pattern.rs:17:13
+   |
+LL |         let [0] = v4;
+   |             ^^^ patterns `&[]` and `&[_, _, ..]` not covered
+   |
+   = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
+   = note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
+   = note: the matched value is of type `&[u32]`
+help: you might want to use `if let` to ignore the variants that aren't matched
+   |
+LL |         if let [0] = v4 { todo!() };
+   |         ++              +++++++++++
+
+error[E0005]: refutable pattern in local binding
+  --> $DIR/bad-pattern.rs:18:13
+   |
+LL |         let Refutable::A = v3;
+   |             ^^^^^^^^^^^^ pattern `Refutable::B` not covered
+   |
+   = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
+   = note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
+note: `Refutable` defined here
+  --> $DIR/bad-pattern.rs:4:6
+   |
+LL | enum Refutable {
+   |      ^^^^^^^^^
+LL |     A,
+LL |     B,
+   |     - not covered
+   = note: the matched value is of type `Refutable`
+help: you might want to use `if let` to ignore the variant that isn't matched
+   |
+LL |         if let Refutable::A = v3 { todo!() };
+   |         ++                       +++++++++++
+
+error[E0005]: refutable pattern in local binding
+  --> $DIR/bad-pattern.rs:19:13
+   |
+LL |         let PAT = v1;
+   |             ^^^
+   |             |
+   |             pattern `1_u32..=u32::MAX` not covered
+   |             missing patterns are not covered because `PAT` is interpreted as a constant pattern, not a new variable
+   |             help: introduce a variable instead: `PAT_var`
+   |
+   = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
+   = note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
+   = note: the matched value is of type `u32`
+
+error: aborting due to 7 previous errors
+
+For more information about this error, try `rustc --explain E0005`.