pub fn expand_speculative(
db: &dyn ExpandDatabase,
actual_macro_call: MacroCallId,
speculative_args: &SyntaxNode,
token_to_map: SyntaxToken,
) -> Option<(SyntaxNode, SyntaxToken)>Expand description
This expands the given macro call, but with different arguments. This is
used for completion, where we want to see what ‘would happen’ if we insert a
token. The token_to_map mapped down into the expansion, with the mapped
token returned.