[Fix rubocop#12259] Fix an error for Lint/MixedCaseRange

Fixes rubocop#12259. This PR fixes an error for `Lint/MixedCaseRange` when using nested character class in regexp.
koic · Oct 11, 2023 · e208165 · e208165
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diff --git a/changelog/fix_an_error_for_lint_mixed_case_range.md b/changelog/fix_an_error_for_lint_mixed_case_range.md
@@ -0,0 +1 @@
+* [#12259](https://github.com/rubocop/rubocop/issues/12259): Fix an error for `Lint/MixedCaseRange` when using nested character class in regexp. ([@koic][])
diff --git a/lib/rubocop/cop/lint/mixed_case_range.rb b/lib/rubocop/cop/lint/mixed_case_range.rb
@@ -95,7 +95,7 @@ def skip_expression?(expr)
 
         def skip_range?(range_start, range_end)
           [range_start, range_end].any? do |bound|
-            bound.type == :escape
+            bound.type != :literal
           end
         end
 

diff --git a/spec/rubocop/cop/lint/mixed_case_range_spec.rb b/spec/rubocop/cop/lint/mixed_case_range_spec.rb
@@ -221,4 +221,10 @@
       foo = /[A\-z]/
     RUBY
   end
+
+  it 'does not register an offense with nested character class' do
+    expect_no_offenses(<<~RUBY)
+      foo = /[a-[bc]]/
+    RUBY
+  end
 end