1 files changed, 39 insertions, 0 deletions
diff --git a/src/tools/clippy/clippy_lints/src/transmute/transmutes_expressible_as_ptr_casts.rs b/src/tools/clippy/clippy_lints/src/transmute/transmutes_expressible_as_ptr_casts.rs
new file mode 100644
index 000000000..626d7cd46
--- /dev/null
+++ b/src/tools/clippy/clippy_lints/src/transmute/transmutes_expressible_as_ptr_casts.rs
@@ -0,0 +1,39 @@
+use super::utils::can_be_expressed_as_pointer_cast;
+use super::TRANSMUTES_EXPRESSIBLE_AS_PTR_CASTS;
+use clippy_utils::diagnostics::span_lint_and_then;
+use clippy_utils::sugg;
+use rustc_errors::Applicability;
+use rustc_hir::Expr;
+use rustc_lint::LateContext;
+use rustc_middle::ty::Ty;
+
+/// Checks for `transmutes_expressible_as_ptr_casts` lint.
+/// Returns `true` if it's triggered, otherwise returns `false`.
+pub(super) fn check<'tcx>(
+    cx: &LateContext<'tcx>,
+    e: &'tcx Expr<'_>,
+    from_ty: Ty<'tcx>,
+    to_ty: Ty<'tcx>,
+    arg: &'tcx Expr<'_>,
+) -> bool {
+    if can_be_expressed_as_pointer_cast(cx, e, from_ty, to_ty) {
+        span_lint_and_then(
+            cx,
+            TRANSMUTES_EXPRESSIBLE_AS_PTR_CASTS,
+            e.span,
+            &format!(
+                "transmute from `{}` to `{}` which could be expressed as a pointer cast instead",
+                from_ty, to_ty
+            ),
+            |diag| {
+                if let Some(arg) = sugg::Sugg::hir_opt(cx, arg) {
+                    let sugg = arg.as_ty(&to_ty.to_string()).to_string();
+                    diag.span_suggestion(e.span, "try", sugg, Applicability::MachineApplicable);
+                }
+            },
+        );
+        true
+    } else {
+        false
+    }
+}