in yaml_test_runner/src/step/do.rs [617:639]
fn from_set_value(s: &str) -> Tokens {
// check if the entire string is a token
if s.starts_with('$') {
let ident = syn::Ident::from(
s.trim_start_matches('$')
.trim_start_matches('{')
.trim_end_matches('}'),
);
quote! { #ident }
} else {
// only part of the string is a token, so substitute
let token = syn::Ident::from(
SET_DELIMITED_REGEX
.captures(s)
.unwrap()
.get(1)
.unwrap()
.as_str(),
);
let replacement = SET_DELIMITED_REGEX.replace_all(s, "{}");
quote! { Value::String(format!(#replacement, #token.as_str().unwrap())) }
}
}