Function rustc_expand::mbe::macro_check::check_binders

fn check_binders(
    sess: &ParseSess, 
    node_id: NodeId, 
    lhs: &TokenTree, 
    macros: &Stack<'_, MacroState<'_>>, 
    binders: &mut FxHashMap<MacroRulesNormalizedIdent, BinderInfo>, 
    ops: &Stack<'_, KleeneToken>, 
    valid: &mut bool
)

Checks lhs as part of the LHS of a macro definition, extends binders with new binders, and sets valid to false in case of errors.

Arguments:

• sess is used to emit diagnostics and lints
• node_id is used to emit lints
• lhs is checked as part of a LHS
• macros is the stack of possible outer macros
• binders contains the binders of the LHS
• ops is the stack of Kleene operators from the LHS
• valid is set in case of errors