Function rustc_ap_rustc_span::with_source_map

pub fn with_source_map<T, F: FnOnce() -> T>(
    source_map: Lrc<SourceMap>, 
    f: F
) -> T

Calls the provided closure, using the provided SourceMap to format any spans that are debug-printed during the closure'e exectuino.

Normally, the global TyCtxt is used to retrieve the SourceMap (see rustc_interface::callbacks::span_debug1). However, some parts of the compiler (e.g. rustc_parse) may debug-print Spans before a TyCtxtis available. In this case, we fall back to theSourceMapprovided to this function. If that is not available, we fall back to printing the rawSpan` field values