Project fails (or takes long time) to compile on latest stable and nightly (hang/stackoverflow) #57735
Description
While attempting to compile my application (or simply run cargo check), rustc will crash, with slightly different results depending on whether it's the stable or nightly branch.
OS: Windows 10 x64 version 1809 build 17763.253
stable toolchain
- stable-x86_64-pc-windows-msvc
- rustc 1.32.0 (9fda7c2 2019-01-16)
cargo check result: thread 'main' has overflowed its stack
Repro steps
- Clone my project
cd rs-nesgit checkout remove-unstable-featurescargo check
nightly toolchain
- nightly-x86_64-pc-windows-msvc
- rustc 1.33.0-nightly (daa53a5 2019-01-17)
cargo check result: Process finished with exit code -1
Repro steps
- Same as above, but on the master branch
Suspected cause
I've narrowed down the issue to a procedural macro that I've had no issues compiling in the past (on nightly). It generates a large match statement which made me think that this recent change may be related, but I have no evidence to support it other than the fact that it changes how the compiler behaves wrt large match statements.
It's also worth noting that I created the remove-unstable-features branch specifically to see if this was only an issue on nightly. It's possible that the error seen on stable is a manifestation of not using unstable features I had been relying on (box patterns, in this case).