false positive explicit_type_interface on if-case-let

[dwirandytlvk]

New Issue Checklist

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

Describe the bug

All the if statements that have a let inside the case clause are triggering this rule.

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

$ swiftlint lint

Explicit Type Interface Violation: Properties should have a type interface (explicit_type_interface)

Environment

• SwiftLint version 0.49.1
• Installation method used (Cocoapods)?
• Paste your configuration file:

only_rules:
- anyobject_protocol
- control_statement
- explicit_type_interface
- force_unwrapping
- force_cast
- identifier_name
- trailing_semicolon
- line_length
- legacy_constructor
- legacy_constant
- legacy_cggeometry_functions
- legacy_nsgeometry_functions
- return_arrow_whitespace
- redundant_void_return
- void_return
- unused_closure_parameter
- closure_spacing
- operator_usage_whitespace
- implicitly_unwrapped_optional
- explicit_init
- sorted_imports
- closing_brace
- comma
- duplicate_enum_cases
- duplicate_imports
- statement_position
anyobject_protocol:
  severity: error
identifier_name:
  min_length:
    error: 2
trailing_semicolon:
  severity: error
line_length:
  warning: 200
  ignores_function_declarations: true
  ignores_comments: true
  ignores_interpolated_strings: true
  ignores_urls: true
statement_position:
  statement_mode: uncuddled_else
control_statement:
  severity: error
force_unwrapping:
  severity: error
implicitly_unwrapped_optional:
  severity: error
force_cast:
  severity: warning
duplicate_imports:
  severity: error

• Which Xcode version are you using (check xcodebuild -version)? xcode 14.0.1
• Do you have a sample that shows the issue?

// This triggers a violation:
if case .failure(let error) = errorCompletion {

}