tests: check more cases of unused variables

Author: mhinz

spec/syntax/variable_spec.rb

@@ -52,4 +52,24 @@ def sign_in(conn, %{
  expect(str).to include_elixir_syntax('elixirUnusedVariable', '_user')
  expect(str).to include_elixir_syntax('elixirUnusedVariable', '_claims')
  end
+
+ it 'unused, in anonymous function, inline' do
+ expect(<<~EOF).to include_elixir_syntax('elixirUnusedVariable', '_unused')
+ fun = fn _unused -> false end
+ EOF
+ end
+
+ it 'unused, in anonymous function, multiple lines' do
+ expect(<<~EOF).to include_elixir_syntax('elixirUnusedVariable', '_unused')
+ fun = fn
+ ([], _unused) -> true
+ end
+ EOF
+ end
+
+ it 'unused, in pattern matching' do
+ expect(<<~EOF).to include_elixir_syntax('elixirUnusedVariable', '_unused')
+ _unused = false
+ EOF
+ end
 end