Function parse_non_custom_property_declaration_value_into 

fn parse_non_custom_property_declaration_value_into(
    declarations: &mut SourcePropertyDeclaration,
    context: &ParserContext<'_>,
    input: &mut Parser<'_>,
    start: &ParserState,
    parse_entirely_into: impl FnOnce(&mut SourcePropertyDeclaration, &mut Parser<'_>) -> Result<(), ParseError>,
    parsed_wide_keyword: impl FnOnce(&mut SourcePropertyDeclaration, CSSWideKeyword),
    parsed_custom: impl FnOnce(&mut SourcePropertyDeclaration, VariableValue),
) -> Result<(), ParseError>