Allow binop in css round() argument.

CHANGELOG.md

@@ -32,6 +32,7 @@ project adheres to
 * Improved parse error handling (Issue #141, PR #201, PR #205).
   Many parse errors now match the dart sass error message.
   Also allow "loud" comments in more places.
+* Pure css `round()` may take an expression argument.
 * Updated sass-spec test suite to 2024-11-15.
 
 

rsass/src/sass/functions/math/round.rs

@@ -49,12 +49,6 @@ pub fn css_round(s: &ResolvedArgs) -> Result<Value, CallError> {
             };
         }
         (Err(v0), Some(step), None) => (None, v0, Some(step)),
-        (Err(arg @ Value::BinOp(_)), None, _) => {
-            return Err(CallError::msg(format!(
-                "Single argument {} expected to be simplifiable.",
-                arg.format(Format::introspect()),
-            )));
-        }
         (Err(v), None, _) => (None, v, None),
     };
     let number = NumOrSpecial::try_from(number).named(name!(number))?;

rsass/tests/spec/values/calculation/round/one_argument.rs

@@ -102,7 +102,6 @@ fn sass_script() {
     );
 }
 #[test]
-#[ignore] // unexepected error
 fn unsimplifiable() {
     assert_eq!(
         runner().ok("a {b: round(1px + 2px - var(--c))}\n"),