Function rustfmt_nightly::expr::span_ends_with_comma

pub(crate) fn span_ends_with_comma(
    context: &RewriteContext<'_>,
    span: Span
) -> bool

Returns true if a function call or a method call represented by the given span ends with a trailing comma. This function is used when rewriting macro, as adding or removing a trailing comma from macro can potentially break the code.