Function ra_ap_ide_db::helpers::try_resolve_derive_input_at

pub fn try_resolve_derive_input_at(
    sema: &Semantics<'_, RootDatabase>, 
    derive_attr: &Attr, 
    cursor: &SyntaxToken
) -> Option<MacroDef>

Resolves the path at the cursor token as a derive macro if it inside a token tree of a derive attribute.