syntax_data: {"ast_node_type":"other","tokens":[{"end":99,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // when lowering to MIR in `Builder::perform_test`, treat the constant as a `&str`.
context_before:                 // order to allow `deref!("..."): String`. Since we need a `&str` for the comparison
context_after:                 // This works because `str` and `&str` have the same valtree representation.