Add a test for an ICE with closure captures in erroneous code

Author: jakubadamw

tests/ui/closures/closure-2021-captures-lint-field-projection-ice-119382.rs

@@ -0,0 +1,21 @@
+//! Regression test for <https://github.com/rust-lang/rust/issues/119382>.
+//!
+//! The `-Wrust-2021-incompatible-closure-captures` lint used to ICE
+//! when applied to erroneous code.
+
+//@ edition: 2018
+//@ compile-flags: -Wrust-2021-incompatible-closure-captures
+
+struct V(&mut i32);
+//~^ ERROR missing lifetime specifier
+
+fn nested(v: &V) {
+    || {
+        V(_somename) = v;
+        //~^ ERROR cannot find value `_somename` in this scope
+        //~| ERROR mismatched types
+        v.0 = 0;
+    };
+}
+
+fn main() {}

tests/ui/closures/closure-2021-captures-lint-field-projection-ice-119382.stderr

@@ -0,0 +1,34 @@
+error[E0106]: missing lifetime specifier
+  --> $DIR/closure-2021-captures-lint-field-projection-ice-119382.rs:9:10
+   |
+LL | struct V(&mut i32);
+   |          ^ expected named lifetime parameter
+   |
+help: consider introducing a named lifetime parameter
+   |
+LL | struct V<'a>(&'a mut i32);
+   |         ++++  ++
+
+error[E0425]: cannot find value `_somename` in this scope
+  --> $DIR/closure-2021-captures-lint-field-projection-ice-119382.rs:14:11
+   |
+LL |         V(_somename) = v;
+   |           ^^^^^^^^^ not found in this scope
+
+error[E0308]: mismatched types
+  --> $DIR/closure-2021-captures-lint-field-projection-ice-119382.rs:14:9
+   |
+LL |         V(_somename) = v;
+   |         ^^^^^^^^^^^^   - this expression has type `&V`
+   |         |
+   |         expected `&V`, found `V`
+   |
+help: consider dereferencing to access the inner value using the `Deref` trait
+   |
+LL |         V(_somename) = &*v;
+   |                        ++
+
+error: aborting due to 3 previous errors
+
+Some errors have detailed explanations: E0106, E0308, E0425.
+For more information about an error, try `rustc --explain E0106`.