Don't trigger block_in_if_condition_expr lint if the block is unsafe

src/block_in_if_condition.rs

@@ -74,6 +74,7 @@ impl LateLintPass for BlockInIfCondition {
     fn check_expr(&mut self, cx: &LateContext, expr: &Expr) {
         if let ExprIf(ref check, ref then, _) = expr.node {
             if let ExprBlock(ref block) = check.node {
+                if block.rules == DefaultBlock {
                     if block.stmts.is_empty() {
                         if let Some(ref ex) = block.expr {
                             // don't dig into the expression here, just suggest that they remove
@@ -92,6 +93,7 @@ impl LateLintPass for BlockInIfCondition {
                             snippet_block(cx, block.span, ".."),
                             snippet_block(cx, then.span, "..")));
                     }
+                }
             } else {
                 let mut visitor = ExVisitor { found_block: None };
                 walk_expr(&mut visitor, check);

tests/compile-fail/block_in_if_condition.rs

@@ -60,5 +60,14 @@ fn closure_without_block() {
     }
 }
 
+fn condition_is_unsafe_block() {
+    let a: i32 = 1;
+
+    // this should not warn because the condition is an unsafe block
+    if unsafe { 1u32 == std::mem::transmute(a) } {
+        println!("1u32 == a");
+    }
+}
+
 fn main() {
 }