syntax_data: {"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // Look for a sequence like the following to indicate that we should be peeking at `_1`:
context_before:     for (bb, block_data, call) in peek_calls {
context_after:         //    _2 = &_1;