Avoid returning original macro if expansion fails. #12370
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Closes rust-lang#11692. Instead of returning the original expression, a dummy expression (with identical span) is returned. This prevents infinite loops of failed expansions as well as odd double error messages in certain situations.
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Closes #11692. Instead of returning the original expression, a dummy expression (with identical span) is returned. This prevents infinite loops of failed expansions as well as odd double error messages in certain situations. This is a slightly better fix than #12197, because it does not produce a double error and also fixes a few other cases where an infinite loop could happen. This does not fix the other issue in #11692 (non-builtin macros not being recognised when expanded inside macros), which I think should be moved into a separate issue.
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Jul 25, 2022
…nicola
ide: insert whitespaces surrounding `_` in macro expansion
#### Before
```rust
for_in 0..10 {
foo();
}
```
#### After
```rust
for _ in 0..10 {
foo();
}
```
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Closes #11692. Instead of returning the original expression, a dummy expression
(with identical span) is returned. This prevents infinite loops of failed
expansions as well as odd double error messages in certain situations.
This is a slightly better fix than #12197, because it does not produce a double error and also fixes a few other cases where an infinite loop could happen.
This does not fix the other issue in #11692 (non-builtin macros not being recognised when expanded inside macros), which I think should be moved into a separate issue.