syntax_data: {"ast_node_type":"function","tokens":[{"end":60,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet: fn pat_is_catchall(pat: &DeconstructedPat<'_, '_>) -> bool {
context_before: /// Checks for common cases of "catchall" patterns that may not be intended as such.
context_after:     match pat.ctor() {