syntax_data: {"ast_node_type":"import","tokens":[{"end":52,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // flag, so we cannot reuse it here.
context_before:                 // The `pretty_print_const` formatting depends on -Zverbose-internals
context_after:                 let scalar = cv.valtree.unwrap_leaf();