pub fn collect_string_interpolation_refs(s: &str, out: &mut BTreeSet<String>)Expand description
Extract {name} interpolation references from a string
literal’s contents. Skips format specifiers ({:05},
{:.2}) and non-identifier bodies. This is the
string-interpolation grammar — the only place {name} is a
reference inside a parsed Polydat expression. (Raw YAML
template fields like an op’s prepared: use the same
interpolation grammar but never reach the Polydat parser; the
YAML-fusion layer applies collect_string_interpolation_refs
to those directly.)