False negative in unneeded_parentheses_in_closure_argument when using _

[marcelofabri]

New Issue Checklist

• Updated SwiftLint to the latest version
• I searched for existing GitHub issues

Bug Report

Complete output when running SwiftLint, including the stack trace and command used

$ echo "call(arg: { ↓(bar, _) in }" | swiftlint lint --no-cache --use-stdin --enable-all-rules
Loading configuration from '.swiftlint.yml'
Done linting! Found 0 violations, 0 serious in 1 file.

Environment

• SwiftLint version (run swiftlint version to be sure)? 0.24.2
• Installation method used (Homebrew, CocoaPods, building from source, etc)? Homebrew
• Paste your configuration file:

opt_in_rules:
  -unneeded_parentheses_in_closure_argument

• Are you using nested configurations?
  If so, paste their relative paths and respective contents. No
• Which Xcode version are you using (check xcode-select -p)? 9.2
• Do you have a sample that shows the issue? Run echo "[string here]" | swiftlint lint --no-cache --use-stdin --enable-all-rules
  to quickly test if your example is really demonstrating the issue. If your example is more
  complex, you can use swiftlint lint --path [file here] --no-cache --enable-all-rules.

// This should trigger a violation:
call(arg: { ↓(bar, _) in })\n