Auto merge of #106966 - matthiaskrgr:rollup-e34pevi, r=matthiaskrgr

Rollup of 7 pull requests

Successful merges:

 - #106591 (suggestion for attempted integer identifier in patterns)
 - #106712 (make error emitted on `impl &Trait` nicer)
 - #106829 (Unify `Opaque`/`Projection` handling in region outlives code)
 - #106869 (rustdoc: remove redundant item kind class from `.item-decl > pre`)
 - #106949 (ConstBlocks are poly if their substs are poly)
 - #106953 (Document `EarlyBinder::subst_identity` and `skip_binder`)
 - #106958 (Don't add A-bootstrap to PRs modifying Cargo.lock)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

2 files changed, 42 insertions, 0 deletions

diff --git a/tests/ui/pattern/issue-106552.rs b/tests/ui/pattern/issue-106552.rs
new file mode 100644
index 00000000000..aa2c141e05e
--- /dev/null
+++ b/tests/ui/pattern/issue-106552.rs
@@ -0,0 +1,7 @@
+fn main() {
+    let 5 = 6;
+    //~^ error refutable pattern in local binding [E0005]
+
+    let x @ 5 = 6;
+    //~^ error refutable pattern in local binding [E0005]
+}
diff --git a/tests/ui/pattern/issue-106552.stderr b/tests/ui/pattern/issue-106552.stderr
new file mode 100644
index 00000000000..ed5d40c0968
--- /dev/null
+++ b/tests/ui/pattern/issue-106552.stderr
@@ -0,0 +1,35 @@
+error[E0005]: refutable pattern in local binding
+  --> $DIR/issue-106552.rs:2:9
+   |
+LL |     let 5 = 6;
+   |         ^ patterns `i32::MIN..=4_i32` and `6_i32..=i32::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 `i32`
+help: you might want to use `if let` to ignore the variants that aren't matched
+   |
+LL |     if let 5 = 6 { todo!() }
+   |     ++           ~~~~~~~~~~~
+help: alternatively, you could prepend the pattern with an underscore to define a new named variable; identifiers cannot begin with digits
+   |
+LL |     let _5 = 6;
+   |         +
+
+error[E0005]: refutable pattern in local binding
+  --> $DIR/issue-106552.rs:5:9
+   |
+LL |     let x @ 5 = 6;
+   |         ^^^^^ patterns `i32::MIN..=4_i32` and `6_i32..=i32::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 `i32`
+help: you might want to use `let else` to handle the variants that aren't matched
+   |
+LL |     let x @ 5 = 6 else { todo!() };
+   |                   ++++++++++++++++
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0005`.