Function locate_typecheck 

pub(crate) fn locate_typecheck(
    kind: &ObjectTypeCheckErrorKind,
    source: &str,
) -> Option<Range<usize>>

Locate the byte range a typecheck error points at within source.

Dispatches to locate_plan / locate_catalog for the wrapped mz_sql error, or returns the parser’s byte offset directly. Internal variants have no locatable position.