Rollup merge of #107580 - lenko-d:default_value_for_a_lifetime_generic_parameter_produces_confusing_diagnostic, r=compiler-errors

Recover from lifetimes with default lifetimes in generic args

Fixes [#107492](https://github.com/rust-lang/rust/issues/107492)

compiler/rustc_parse/src/errors.rs

@@ -1601,6 +1601,14 @@ pub(crate) struct UnexpectedSelfInGenericParameters {
     pub span: Span,
 }
 
+#[derive(Diagnostic)]
+#[diag(parse_unexpected_default_value_for_lifetime_in_generic_parameters)]
+pub(crate) struct UnexpectedDefaultValueForLifetimeInGenericParameters {
+    #[primary_span]
+    #[label]
+    pub span: Span,
+}
+
 #[derive(Diagnostic)]
 #[diag(parse_multiple_where_clauses)]
 pub(crate) struct MultipleWhereClauses {