Enum MacroFault 

pub enum MacroFault<'a> {
    Undefined(&'a str),
    Recursive(&'a str),
    Unterminated(&'a str),
}

Which fault an expansion hit, and the first text that hit it — the macro name for the two arms that parsed one, the copied-through source for the arm that did not. One variant per way C sets entry->error, so a caller cannot report a recursion as an undefined name, nor either of them as a reference that was never closed.

Variants

Undefined(&'a str)

No definition, no env value, no default — C’s $(name,undefined) placeholder (macCore.c:913-928).

Recursive(&'a str)

Resolving the name re-entered itself — C’s refentry->visited guard (macCore.c:895-904).

Unterminated(&'a str)

The closing delimiter never matched the opener, so C copied the reference and everything after it through verbatim (macCore.c:862-875). The payload is that copied text — this arm carries no macro NAME because the reference never produced one.

Trait Implementations

impl<'a> Clone for MacroFault<'a>

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Copy for MacroFault<'a>

impl<'a> Debug for MacroFault<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a> Eq for MacroFault<'a>

impl<'a> PartialEq for MacroFault<'a>

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl<'a> StructuralPartialEq for MacroFault<'a>