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1ce8de3087
Add a `-Zdump-drop-tracking-cfg` debugging flag
This is useful for debugging drop-tracking; previously, you had to recompile
rustc from source and manually add a call to `write_graph_to_file`. This
makes the option more discoverable and configurable at runtime.
I also took the liberty of making the labels for the CFG nodes much easier to read:
previously, they looked like `id(2), local_id: 48`, now they look like
```
expr from_config (hir_id=HirId { owner: DefId(0:10 ~ default_struct_update[79f9]::foo), local_id: 2})
```
r? ``@eholk``
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|---|---|---|
| .. | ||
| cgu_reuse_tracker.rs | ||
| code_stats.rs | ||
| config.rs | ||
| cstore.rs | ||
| filesearch.rs | ||
| lib.rs | ||
| options.rs | ||
| output.rs | ||
| parse.rs | ||
| search_paths.rs | ||
| session.rs | ||
| utils.rs | ||