Layout/SpaceBeforeBlockBraces cop raises RuntimeError

[j-miyake]

Layout/SpaceBeforeBlockBraces cop raises undefined local variable or method when processing a file like below.

foo.rb

context do
  let(:foo){{a: 1, b: 2}}
end

Expected behavior

Rubocop should not raise the error.

Actual behavior

Rubocop raises the error.

Steps to reproduce the problem

Under the following configuration,

Style/BlockDelimiters
  Enable: true

Layout/SpaceBeforeBlockBraces
  EnforcedStyle: no_space

Run rubocop

$ rubocop -d foo.rb
Inspecting 1 file
Scanning /Users/johnny/test/foo.rb
An error occurred while Layout/SpaceBeforeBlockBraces cop was inspecting /Users/johnny/test/foo.rb:2:2.
undefined local variable or method `node' for #<RuboCop::Cop::Layout::SpaceBeforeBlockBraces:0x00007fabed2fb458>
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/cop/layout/space_before_block_braces.rb:123:in `conflict_with_block_delimiters?'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/cop/layout/space_before_block_braces.rb:50:in `on_block'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/cop/commissioner.rb:57:in `block (2 levels) in trigger_responding_cops'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/cop/commissioner.rb:136:in `with_cop_error_handling'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/cop/commissioner.rb:56:in `block in trigger_responding_cops'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/cop/commissioner.rb:55:in `each'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/cop/commissioner.rb:55:in `trigger_responding_cops'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/cop/commissioner.rb:32:in `block (2 levels) in <class:Commissioner>'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/ast/traversal.rb:164:in `on_block'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/cop/commissioner.rb:33:in `block (2 levels) in <class:Commissioner>'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/ast/traversal.rb:13:in `walk'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/cop/commissioner.rb:44:in `investigate'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/cop/team.rb:124:in `investigate'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/cop/team.rb:112:in `offenses'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/cop/team.rb:44:in `inspect_file'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/runner.rb:296:in `inspect_file'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/runner.rb:244:in `block in do_inspection_loop'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/runner.rb:276:in `block in iterate_until_no_changes'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/runner.rb:269:in `loop'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/runner.rb:269:in `iterate_until_no_changes'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/runner.rb:240:in `do_inspection_loop'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/runner.rb:119:in `block in file_offenses'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/runner.rb:143:in `file_offense_cache'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/runner.rb:117:in `file_offenses'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/runner.rb:108:in `process_file'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/runner.rb:87:in `block in each_inspected_file'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/runner.rb:86:in `each'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/runner.rb:86:in `reduce'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/runner.rb:86:in `each_inspected_file'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/runner.rb:73:in `inspect_files'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/runner.rb:39:in `run'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/cli/command/execute_runner.rb:21:in `execute_runner'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/cli/command/execute_runner.rb:13:in `run'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/cli/command.rb:10:in `run'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/cli/environment.rb:17:in `run'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/cli.rb:65:in `run_command'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/cli.rb:72:in `execute_runners'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/lib/rubocop/cli.rb:41:in `run'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/exe/rubocop:13:in `block in <top (required)>'
/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/benchmark.rb:308:in `realtime'
/Library/Ruby/Gems/2.3.0/gems/rubocop-0.78.0/exe/rubocop:12:in `<top (required)>'
/usr/local/bin/rubocop:22:in `load'
/usr/local/bin/rubocop:22:in `<main>'

RuboCop version

$ rubocop -V
0.78.0 (using Parser 2.6.5.0, running on ruby 2.3.7 universal.x86_64-darwin18)