Fix ICE with -Zunpretty=hir,typed when an expression occurs in a function signature

src/test/ui/unpretty-expr-fn-arg.rs

@@ -0,0 +1,13 @@
+// Regression test for the ICE described in #82328. The pretty-printer for
+// compile-flags: -Zunpretty=hir,typed
+// would previously retrieve type-checking results when entering a body,
+// which means that type information was not available for expressions
+// occurring in function signatures, as in the `foo` example below, leading
+// to an ICE.
+
+// check-pass
+#![allow(dead_code)]
+
+fn main() {}
+
+fn foo(-128..=127: i8) {}

src/test/ui/unpretty-expr-fn-arg.stdout

@@ -0,0 +1,17 @@
+// Regression test for the ICE described in #82328. The pretty-printer for
+// compile-flags: -Zunpretty=hir,typed
+// would previously retrieve type-checking results when entering a body,
+// which means that type information was not available for expressions
+// occurring in function signatures, as in the `foo` example below, leading
+// to an ICE.
+
+// check-pass
+#![allow(dead_code)]
+#[prelude_import]
+use ::std::prelude::rust_2015::*;
+#[macro_use]
+extern crate std;
+
+fn main() ({ } as ())
+
+fn foo((-(128 as i8) as i8) ...(127 as i8): i8) ({ } as ())