syntax_data: {"ast_node_type":"other","tokens":[{"end":21,"kind":"keyword","start":0,"text":"None"}]}
source_snippet:             None => {
context_before:         .map(|remap| match remap.rsplit_once('=') {
context_after:                 early_dcx.early_fatal("--remap-path-prefix must contain '=' between FROM and TO")