Non-fatally assert that tts
is empty. Note that this function
returns even when tts
is non-empty, macros that need to stop
compilation should call
cx.parse_sess.span_diagnostic.abort_if_errors()
(this should be
done as rarely as possible).
Extracts a string literal from the macro expanded version of expr
,
returning a diagnostic error of err_msg
if expr
is not a string literal.
The returned bool indicates whether an applicable suggestion has already been
added to the diagnostic to avoid emitting multiple suggestions. Err(None)
indicates that an ast error was encountered.
Extracts a string literal from the macro expanded version of expr
,
emitting err_msg
if expr
is not a string literal. This does not stop
compilation on error, merely emits a non-fatal error and returns None
.
Extracts comma-separated expressions from tts
.
On error, emit it, and return None
.
Interpreting tts
as a comma-separated sequence of expressions,
expect exactly one string literal, or emit an error and return None
.
Parse an expression. On error, emit it, advancing to Eof
, and return None
.
This nonterminal looks like some specific enums from
proc-macro-hack
and procedural-masquerade
crates.
We need to maintain some special pretty-printing behavior for them due to incorrect
asserts in old versions of those crates and their wide use in the ecosystem.
See issue #73345 for more details.
FIXME(#73933): Remove this eventually.
Resolves a path
mentioned inside Rust code, returning an absolute path.