Function rustc_expand::mbe::macro_check::check_meta_variables

pub(super) fn check_meta_variables(
    psess: &ParseSess,
    node_id: NodeId,
    span: Span,
    lhses: &[TokenTree],
    rhses: &[TokenTree]
) -> Result<(), ErrorGuaranteed>

Checks that meta-variables are used correctly in a macro definition.

Arguments:

• psess is used to emit diagnostics and lints
• node_id is used to emit lints
• span is used when no spans are available
• lhses and rhses should have the same length and represent the macro definition