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1cf2cf91e7
Rust v0 symbols can have `#` chars in them, things like this:
```
core::panic::unwind_safe::AssertUnwindSafe<<proc_macro::bridge::server::Dispat
cher<proc_macro::bridge::server::MarkedTypes<rustc_expand::proc_macro_server::Rustc>> as proc_macro::bridge::server::DispatcherTrait>::dispatch::{closure#14}>, ()>
```
`cg_diff` currently messes these up in two ways.
- It treats anything after a `#` in the input file as a comment. In
comparison, `cg_annotate` only treats a `#` as starting a comment at
the start of a line.
- It uses `#` to temporarily join file names and function names while
processing.
This commit adjusts the parsing to fix the first problem, and changes
the joiner sequence to `###` to fix the second problem.