syntax_data: {"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"ExprKind::Let"}]}
source_snippet:             ExprKind::Let { expr: _, pat: ref guard_pat } => {
context_before:         match self.thir.exprs[guard_expr].kind {
context_after:                 // FIXME: pass a proper `opt_match_place`