new_without_default should not warn about unsafe new

clippy_lints/src/new_without_default.rs

@@ -116,6 +116,10 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NewWithoutDefault {
                             // can't be implemented by default
                             return;
                         }
+                        if sig.header.unsafety == hir::Unsafety::Unsafe {
+                            // can't be implemented for unsafe new
+                            return;
+                        }
                         if impl_item.generics.params.iter().any(|gen| match gen.kind {
                             hir::GenericParamKind::Type { .. } => true,
                             _ => false

tests/ui/new_without_default.rs

@@ -101,4 +101,10 @@ pub trait TraitWithNew: Sized {
     }
 }
 
+pub struct IgnoreUnsafeNew;
+
+impl IgnoreUnsafeNew {
+    pub unsafe fn new() -> Self { IgnoreUnsafeNew }
+}
+
 fn main() {}