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Diffstat (limited to 'crates/hir-def/src/expander.rs')
| -rw-r--r-- | crates/hir-def/src/expander.rs | 32 |
1 files changed, 20 insertions, 12 deletions
diff --git a/crates/hir-def/src/expander.rs b/crates/hir-def/src/expander.rs index cc85bd893a..6db8398bc9 100644 --- a/crates/hir-def/src/expander.rs +++ b/crates/hir-def/src/expander.rs @@ -164,18 +164,26 @@ impl Expander { return ExpandResult { value: None, err }; }; - Self::enter_expand_inner(db, call_id, err).map(|value| { - value.and_then(|InFile { file_id, value }| { - let parse = value.cast::<T>()?; - - self.recursion_depth += 1; - self.hygiene = Hygiene::new(db.upcast(), file_id); - let old_file_id = std::mem::replace(&mut self.current_file_id, file_id); - let mark = - Mark { file_id: old_file_id, bomb: DropBomb::new("expansion mark dropped") }; - Some((mark, parse)) - }) - }) + let res = Self::enter_expand_inner(db, call_id, err); + match res.err { + // If proc-macro is disabled or unresolved, we want to expand to a missing expression + // instead of an empty tree which might end up in an empty block. + Some(ExpandError::UnresolvedProcMacro(_)) => res.map(|_| None), + _ => res.map(|value| { + value.and_then(|InFile { file_id, value }| { + let parse = value.cast::<T>()?; + + self.recursion_depth += 1; + self.hygiene = Hygiene::new(db.upcast(), file_id); + let old_file_id = std::mem::replace(&mut self.current_file_id, file_id); + let mark = Mark { + file_id: old_file_id, + bomb: DropBomb::new("expansion mark dropped"), + }; + Some((mark, parse)) + }) + }), + } } } |