Migrate 'trivial cast' lint

Author: clubby789

compiler/rustc_hir_typeck/messages.ftl

@@ -134,6 +134,12 @@ hir_typeck_suggest_boxing_when_appropriate = store this in the heap by calling `
 
 hir_typeck_suggest_ptr_null_mut = consider using `core::ptr::null_mut` instead
 
+hir_typeck_trivial_cast = trivial {$numeric ->
+    [true] numeric cast
+    *[false] cast
+    }: `{$expr_ty}` as `{$cast_ty}`
+    .help = cast can be replaced by coercion; this might require a temporary variable
+
 hir_typeck_union_pat_dotdot = `..` cannot be used in union patterns
 
 hir_typeck_union_pat_multiple_fields = union patterns should have exactly one field

compiler/rustc_hir_typeck/src/cast.rs

@@ -635,31 +635,18 @@ impl<'a, 'tcx> CastCheck<'tcx> {
     }
 
     fn trivial_cast_lint(&self, fcx: &FnCtxt<'a, 'tcx>) {
-        let t_cast = self.cast_ty;
-        let t_expr = self.expr_ty;
-        let (adjective, lint) = if t_cast.is_numeric() && t_expr.is_numeric() {
-            ("numeric ", lint::builtin::TRIVIAL_NUMERIC_CASTS)
+        let (numeric, lint) = if self.cast_ty.is_numeric() && self.expr_ty.is_numeric() {
+            (true, lint::builtin::TRIVIAL_NUMERIC_CASTS)
         } else {
-            ("", lint::builtin::TRIVIAL_CASTS)
+            (false, lint::builtin::TRIVIAL_CASTS)
         };
-        fcx.tcx.struct_span_lint_hir(
+        let expr_ty = fcx.resolve_vars_if_possible(self.expr_ty);
+        let cast_ty = fcx.resolve_vars_if_possible(self.cast_ty);
+        fcx.tcx.emit_spanned_lint(
             lint,
             self.expr.hir_id,
             self.span,
-            DelayDm(|| {
-                format!(
-                    "trivial {}cast: `{}` as `{}`",
-                    adjective,
-                    fcx.ty_to_string(t_expr),
-                    fcx.ty_to_string(t_cast)
-                )
-            }),
-            |lint| {
-                lint.help(
-                    "cast can be replaced by coercion; this might \
-                     require a temporary variable",
-                )
-            },
+            errors::TrivialCast { numeric, expr_ty, cast_ty },
         );
     }
 

compiler/rustc_hir_typeck/src/errors.rs

@@ -487,6 +487,15 @@ pub struct SuggestPtrNullMut {
     pub span: Span,
 }
 
+#[derive(LintDiagnostic)]
+#[diag(hir_typeck_trivial_cast)]
+#[help]
+pub struct TrivialCast<'tcx> {
+    pub numeric: bool,
+    pub expr_ty: Ty<'tcx>,
+    pub cast_ty: Ty<'tcx>,
+}
+
 #[derive(Diagnostic)]
 #[diag(hir_typeck_no_associated_item, code = "E0599")]
 pub struct NoAssociatedItem {