fix an if statement that can be collapsed

Author: folkertdev

crates/libm-macros/src/lib.rs

@@ -266,6 +266,7 @@ fn validate(input: &mut StructuredInput) -> syn::Result<Vec<&'static MathOpInfo>
         }
     }
 
+    #[allow(clippy::collapsible_if)]
     if let Some(map) = &input.fn_extra {
         if !map.keys().any(|key| key == "_") {
             // No default provided; make sure every expected function is covered
@@ -282,7 +283,7 @@ fn validate(input: &mut StructuredInput) -> syn::Result<Vec<&'static MathOpInfo>
                     input.fn_extra_span.unwrap(),
                     format!(
                         "`fn_extra`: no default `_` pattern specified and the following \
-                         patterns are not covered: {fns_not_covered:#?}"
+                     patterns are not covered: {fns_not_covered:#?}"
                     ),
                 );
                 return Err(e);