syntax_data: {"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"Err(SelectionError::Overflow(OverflowError::Canonical))"}]}
source_snippet:                     Err(SelectionError::Overflow(OverflowError::Canonical))
context_before:                 Err(OverflowError::Canonical) => {
context_after:                 }