New lint: dangling_pointers_from_temporaries

compiler/rustc_lint/src/lints.rs

@@ -1137,16 +1137,19 @@ pub(crate) struct IgnoredUnlessCrateSpecified<'a> {
     pub name: Symbol,
 }
 
-// methods.rs
+// dangling.rs
 #[derive(LintDiagnostic)]
-#[diag(lint_cstring_ptr)]
+#[diag(lint_dangling_pointers_from_temporaries)]
 #[note]
 #[help]
-pub(crate) struct CStringPtr {
-    #[label(lint_as_ptr_label)]
-    pub as_ptr: Span,
-    #[label(lint_unwrap_label)]
-    pub unwrap: Span,
+// FIXME: put #[primary_span] on `ptr_span` once it does not cause conflicts
+pub(crate) struct DanglingPointersFromTemporaries<'tcx> {
+    pub callee: Symbol,
+    pub ty: Ty<'tcx>,
+    #[label(lint_label_ptr)]
+    pub ptr_span: Span,
+    #[label(lint_label_temporary)]
+    pub temporary_span: Span,
 }
 
 // multiple_supertrait_upcastable.rs