Subject: [bug#35126] [PATCH] gnu: rust: Enable parallel tests starting with 1.26.

From: Danny Milosavljevic <[email-masked]>
Date: Wed, 3 Apr 2019 19:00:44 +0200

* gnu/packages/rust.scm (rust-1.26)[arguments]<#:phases>[check]: Enable
parallel tests.
---
 gnu/packages/rust.scm | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/gnu/packages/rust.scm b/gnu/packages/rust.scm
index 63426a12fc..23b28cce23 100644
--- a/gnu/packages/rust.scm
+++ b/gnu/packages/rust.scm
@@ -724,6 +724,11 @@ jemalloc = \"" jemalloc "/lib/libjemalloc_pic.a" "\"
           `(modify-phases ,phases
              ;; binaryen was replaced with LLD project from LLVM
              (delete 'dont-build-native)
+             (replace 'check
+               (lambda* _
+                 ;; Enable parallel execution.
+                 (invoke "./x.py" (string-append "-j" (number->string (parallel-job-count))) "test" "-vv")
+                 (invoke "./x.py" (string-append "-j" (number->string (parallel-job-count))) "test" "src/tools/cargo")))
              (replace 'remove-unsupported-tests
                (lambda* _
                  ;; Our ld-wrapper cannot process non-UTF8 bytes in LIBRARY_PATH.