[bug#31955] [PATCH] gnu: rust: support build with glibc-2.27, update to 1.26.2

[Danny Milosavljevic]

Hi Nikolai,

I get a test failure after I applied both patches and then invoke "guix package 
-i rust".

egrep 'starting phase|build-started' RR
@ build-started /gnu/store/zbc701kksgw26g0ckzkhixvjrmqayrjb-rust-1.23.0.drv - 
x86_64-linux 
/var/log/guix/drvs/zb//c701kksgw26g0ckzkhixvjrmqayrjb-rust-1.23.0.drv.bz2
starting phase `set-SOURCE-DATE-EPOCH'
starting phase `set-paths'
starting phase `install-locale'
starting phase `unpack'
starting phase `dont-build-native'
starting phase `patch-tests'
starting phase `patch-cargo-tests'
starting phase `fix-mtime-bug'
starting phase `set-env'
starting phase `bootstrap'
starting phase `patch-usr-bin-file'
starting phase `patch-source-shebangs'
starting phase `patch-cargo-checksums'
starting phase `configure'
starting phase `patch-generated-file-shebangs'
starting phase `reset-timestamps-after-changes'
starting phase `build'
starting phase `check'


failures:
    [run-pass] run-pass/out-of-stack.rs

The phase that should have patched this test out never ran.  I checked the 
source file, it doesn't have the "// ignore-test" part.

I'll take a closer look later but can you check on your side too?

(Also, what's the deal with those comment directives?  Isn't there #[ignore] 
instead?)

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