pub(crate) fn eq_ctxt_suggestion_span(pat: Span, ty: Span) -> Option<Span>Expand description
Computes the pat.between(ty) span for the “use =” suggestion on let pat: ty.
Returns None if pat and ty are in incompatible macro contexts (e.g. pat is a
metavariable from the call site while ty lives in the macro body), in which case no
suggestion is emitted.