Merge commit 'd0cf3481a84e3aa68c2f185c460e282af36ebc42' into clippyup

[rust.git] / src / tools / clippy / clippy_lints / src / casts / mod.rs

diff --git a/src/tools/clippy/clippy_lints/src/casts/mod.rs b/src/tools/clippy/clippy_lints/src/casts/mod.rs
index 6a0eabd089d021b3165d8a09b9922ea596fe9820..be59145afa0032a3cd7c8882c770dd48f4a53288 100644 (file)
--- a/src/tools/clippy/clippy_lints/src/casts/mod.rs
+++ b/src/tools/clippy/clippy_lints/src/casts/mod.rs
@@ -1,3 +1,4 @@
+mod cast_enum_constructor;
 mod cast_lossless;
 mod cast_possible_truncation;
 mod cast_possible_wrap;
@@ -454,6 +455,24 @@
     "casting using `as` between raw pointers to slices of types with different sizes"
 }
 
+declare_clippy_lint! {
+    /// ### What it does
+    /// Checks for casts from an enum tuple constructor to an integer.
+    ///
+    /// ### Why is this bad?
+    /// The cast is easily confused with casting a c-like enum value to an integer.
+    ///
+    /// ### Example
+    /// ```rust
+    /// enum E { X(i32) };
+    /// let _ = E::X as usize;
+    /// ```
+    #[clippy::version = "1.61.0"]
+    pub CAST_ENUM_CONSTRUCTOR,
+    suspicious,
+    "casts from an enum tuple constructor to an integer"
+}
+
 pub struct Casts {
     msrv: Option<RustcVersion>,
 }
@@ -481,6 +500,7 @@ pub fn new(msrv: Option<RustcVersion>) -> Self {
     CHAR_LIT_AS_U8,
     PTR_AS_PTR,
     CAST_ENUM_TRUNCATION,
+    CAST_ENUM_CONSTRUCTOR
 ]);
 
 impl<'tcx> LateLintPass<'tcx> for Casts {
@@ -518,6 +538,7 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
                     cast_sign_loss::check(cx, expr, cast_expr, cast_from, cast_to);
                 }
                 cast_lossless::check(cx, expr, cast_expr, cast_from, cast_to, &self.msrv);
+                cast_enum_constructor::check(cx, expr, cast_expr, cast_from);
             }
         }