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-rw-r--r--activesupport/lib/active_support/core_ext/name_error.rb7
1 files changed, 7 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/name_error.rb b/activesupport/lib/active_support/core_ext/name_error.rb
index 6b447d772b..6d37cd9dfd 100644
--- a/activesupport/lib/active_support/core_ext/name_error.rb
+++ b/activesupport/lib/active_support/core_ext/name_error.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
class NameError
# Extract the name of the missing constant from the exception message.
#
@@ -8,6 +10,11 @@ class NameError
# end
# # => "HelloWorld"
def missing_name
+ # Since ruby v2.3.0 `did_you_mean` gem is loaded by default.
+ # It extends NameError#message with spell corrections which are SLOW.
+ # We should use original_message message instead.
+ message = respond_to?(:original_message) ? original_message : self.message
+
if /undefined local variable or method/ !~ message
$1 if /((::)?([A-Z]\w*)(::[A-Z]\w*)*)$/ =~ message
end