fn insert_value_into_option_or_error(
cx: &AcceptContext<'_>,
param: &MetaItemParser<'_>,
item: &mut Option<Symbol>,
) -> Option<()>
Expand description
Tries to insert the value of a key = value
meta item into an option.
Emits an error when either the option was already Some, or the arguments weren’t of form
name = value