pub fn visible_macros<'a, S: BuildHasher>(
file: &Path,
files: &'a HashMap<PathBuf, PreprocFile, S>,
) -> HashSet<&'a str>Expand description
Every macro name visible to file — its own #defines plus those of
every header it transitively includes — borrowed from files.
The crate-internal form of get_macros, which owns the same names
only because its HashSet<String> return type is published. Callers
inside the crate just probe the result with contains, so borrowing
suffices (issue #1107). Still a merged set and not a list of
per-file sets to probe in turn, because it is consulted once per
identifier run in the whole translation unit: an O(headers) probe
would cost far more than the one-off merge it saves.