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Jonathan Brouwer
1f1084758f
Fix getrandom fallback test on platforms with `panic=abort`
The recently-added linux-getrandom-fallback test fails on targets matching {aarch64*-none, armv7r-eabihf, thumbv7em-eabi*}. This is because those platforms set `panic=abort` by default, and the test relies on being able to catch a panic.
Mark the test as `needs-unwind` so that it won't be run in `panic=abort` configurations.
Also add extra debug information to the panic when getrandom() fails with an unexpected error code on Linux