allow whitespace after trailing comma in map

src/parse/value.rs

@@ -1305,6 +1305,8 @@ impl<'a, 'b: 'a> IntermediateValueIterator<'a, 'b> {
 
         map.insert(key.node, val.node);
 
+        devour_whitespace(paren_toks);
+
         if paren_toks.peek().is_none() {
             return Ok(Spanned {
                 node: Value::Map(map),

tests/map.rs

@@ -177,3 +177,8 @@ test!(
     "$foo: ((\"<\", \"%3c\"), );",
     ""
 );
+test!(
+    map_with_whitespace_after_trailing_comma,
+    "$a: (foo: red, ); a {\n  color: inspect($a);\n}\n",
+    "a {\n  color: (foo: red);\n}\n"
+);