Compiling doctests of the tokei crate during koji builds started to fail (also happened during the F36 mass rebuild). It seems to be isolated to Rust + LLVM 13, since this problem only occurs on Fedora 35+, and not on Fedora 34 (where Rust still uses LLVM 12).

First kind of error (on rawhide):

---- src/language/mod.rs - language::Language::new (line 34) stdout ----
/usr/lib/librustc_driver-fae02aa6c6980a78.so(+0x4af6ec)[0xb427f6ec]
/usr/lib/libc.so.6(__default_sa_restorer+0x0)[0xb3af9380]
/usr/lib/libLLVM-13.so(_ZN4llvm12LiveRegUnits10accumulateERKNS_12MachineInstrE+0x80)[0xaf602f28]
/usr/lib/libLLVM-13.so(_ZN4llvm12RegScavenger25scavengeRegisterBackwardsERKNS_19TargetRegisterClassENS_26MachineInstrBundleIteratorINS_12MachineInstrELb0EEEbib+0x110)[0xaf7c1030]
/usr/lib/libLLVM-13.so(+0xc01ca4)[0xaf7c1ca4]
/usr/lib/libLLVM-13.so(+0xc018d8)[0xaf7c18d8]
/usr/lib/libLLVM-13.so(_ZN4llvm24scavengeFrameVirtualRegsERNS_15MachineFunctionERNS_12RegScavengerE+0x60)[0xaf7c1614]
/usr/lib/libLLVM-13.so(+0xb9bfb8)[0xaf75bfb8]
/usr/lib/libLLVM-13.so(_ZN4llvm19MachineFunctionPass13runOnFunctionERNS_8FunctionE+0x10c)[0xaf671490]
/usr/lib/libLLVM-13.so(_ZN4llvm13FPPassManager13runOnFunctionERNS_8FunctionE+0x238)[0xaf474384]
/usr/lib/libLLVM-13.so(_ZN4llvm13FPPassManager11runOnModuleERNS_6ModuleE+0x30)[0xaf47a1d0]
/usr/lib/libLLVM-13.so(_ZN4llvm6legacy15PassManagerImpl3runERNS_6ModuleE+0x378)[0xaf474934]
Couldn't compile the test.

Second kind of error (Fedora 35):

---- target/release/build/tokei-8e5c426229098942/out/language_type.rs - language::language_type::LanguageType::name (line 228) stdout ----
/usr/lib/librustc_driver-5d25649674e7f2a9.so(+0x4af8f4)[0xb42728f4]
/usr/lib/libc.so.6(__default_sa_restorer+0x0)[0xb3aec300]
Couldn't compile the test.


For now, I will disable compiling and running tests for the tokei crate entirely, since on Fedora, compiling tests is broken on f34 on i686, as well.


Failed koji build on rawhide:
https://koji.fedoraproject.org/koji/taskinfo?taskID=81831081

Failed koji build on f35:
https://koji.fedoraproject.org/koji/taskinfo?taskID=81831106