crate:: prefix to paths where appropriate.
Force us to name impls with just the filename/line number. We
normally try to use types. But at some points, notably while printing
cycle errors, this can result in extra or suboptimal error output,
so this variable disables that check.
Avoids running any queries during any prints that occur
during the closure. This may alter the appearance of some
types (e.g. forcing verbose printing for opaque types).
This method is used during some queries (e.g.
for opaque types), to ensure that any debug printing that
occurs during the query computation does not end up recursively
calling the same query.
Prevent path trimming if it is turned on. Path trimming affects
of various rustc types, for example
std::vec::Vec would be trimmed to
if no other
Vec is found.
Prevent selection of visible paths.
Display impl of DefId will prefer
visible (public) reexports of types as paths.