https://git.ruby-lang.org/ruby.git/commit/?id=73633683c5

From 73633683c5a880af0207a55c6f3ea42c13cb5de1 Mon Sep 17 00:00:00 2001
From: f <f@s...>
Date: Fri, 20 Sep 2019 12:54:48 -0300
Subject: [rubygems/rubygems] add tests

https://github.com/rubygems/rubygems/commit/8a7e27381c

diff --git a/lib/rubygems/platform.rb b/lib/rubygems/platform.rb
index dc2640e..521c552 100644
--- a/lib/rubygems/platform.rb
+++ b/lib/rubygems/platform.rb
@@ -88,7 +88,7 @@ class Gem::Platform https://github.com/ruby/ruby/blob/trunk/lib/rubygems/platform.rb#L88
                       when /^dalvik(\d+)?$/ then        [ 'dalvik',    $1  ]
                       when /^dotnet$/ then              [ 'dotnet',    nil ]
                       when /^dotnet([\d.]*)/ then       [ 'dotnet',    $1  ]
-                      when /linux-?(\w+)?/ then         [ 'linux',     $1  ]
+                      when /linux-?((?!gnu)\w+)?/ then  [ 'linux',     $1  ]
                       when /mingw32/ then               [ 'mingw32',   nil ]
                       when /(mswin\d+)(\_(\d+))?/ then
                         os, version = $1, $3
diff --git a/test/rubygems/test_gem_platform.rb b/test/rubygems/test_gem_platform.rb
index 61d1966..289f078 100644
--- a/test/rubygems/test_gem_platform.rb
+++ b/test/rubygems/test_gem_platform.rb
@@ -76,6 +76,7 @@ class TestGemPlatform < Gem::TestCase https://github.com/ruby/ruby/blob/trunk/test/rubygems/test_gem_platform.rb#L76
       'i386-solaris2.8'        => ['x86',       'solaris',   '2.8'],
       'mswin32'                => ['x86',       'mswin32',   nil],
       'x86_64-linux'           => ['x86_64',    'linux',     nil],
+      'x86_64-linux-musl'      => ['x86_64',    'linux',     'musl'],
       'x86_64-openbsd3.9'      => ['x86_64',    'openbsd',   '3.9'],
       'x86_64-openbsd4.0'      => ['x86_64',    'openbsd',   '4.0'],
       'x86_64-openbsd'         => ['x86_64',    'openbsd',   nil],
-- 
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