Prevent "unnecessary parentheses" warnings in generated expressions

Author: smoelius

cast_checks/tests/basic.rs

@@ -74,3 +74,19 @@ fn inferred_type(x: f64) -> i32 {
 fn block_expression(x: u32) -> f64 {
     x as f64 / 2.0
 }
+
+#[allow(
+    arithmetic_overflow,
+    dead_code,
+    clippy::cast_lossless,
+    clippy::neg_multiply
+)]
+#[cast_checks::enable]
+#[deny(unused_parens, clippy::double_parens)]
+fn unused_parens(use_parens: bool) -> i64 {
+    if use_parens {
+        (-1 * i32::MIN) as i64
+    } else {
+        -1 * i32::MIN as i64
+    }
+}

macro/src/lib.rs

@@ -90,6 +90,7 @@ impl VisitMut for Visitor {
                 #[allow(unused_imports)]
                 use cast_checks::MaybeTryIntoFallback;
 
+                #[allow(unused_parens, clippy::double_parens)]
                 if let Some(result) = cast_checks::MaybeTryInto::<_, #ty >::new( #operand ).maybe_try_into() {
                     result.expect( #msg )
                 } else {