1 files changed, 27 insertions, 0 deletions
diff --git a/lib/bundler/psyched_yaml.rb b/lib/bundler/psyched_yaml.rb
new file mode 100644
index 0000000000..69d2ae78c5
--- /dev/null
+++ b/lib/bundler/psyched_yaml.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+# Psych could be a gem, so try to ask for it
+begin
+  gem "psych"
+rescue LoadError
+end if defined?(gem)
+
+# Psych could be in the stdlib
+# but it's too late if Syck is already loaded
+begin
+  require "psych" unless defined?(Syck)
+rescue LoadError
+  # Apparently Psych wasn't available. Oh well.
+end
+
+# At least load the YAML stdlib, whatever that may be
+require "yaml" unless defined?(YAML.dump)
+
+module Bundler
+  # On encountering invalid YAML,
+  # Psych raises Psych::SyntaxError
+  if defined?(::Psych::SyntaxError)
+    YamlLibrarySyntaxError = ::Psych::SyntaxError
+  else # Syck raises ArgumentError
+    YamlLibrarySyntaxError = ::ArgumentError
+  end
+end