syntax_data: {"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                     // NaNs are not ever equal to anything so they make no sense as patterns.
context_before:                 if is_nan {
context_after:                     // Also see <https://github.com/rust-lang/rfcs/pull/3535>.