Parse error once and not twice if there's more than one available

CHANGELOG.md

@@ -1,5 +1,7 @@
 ## HEAD (unreleased)
 
+- Parse error once and not twice if there's more than one available (https://github.com/zombocom/dead_end/pull/57)
+
 ## 1.1.4
 
 - Avoid including demo gif in built gem (https://github.com/zombocom/dead_end/pull/53)

lib/dead_end/who_dis_syntax_error.rb

@@ -42,6 +42,8 @@ def call
     end
 
     def on_parse_error(msg)
+      return if @error_symbol && @unmatched_symbol
+
       @error = msg
       @unmatched_symbol = :unknown
 

spec/unit/who_dis_syntax_error_spec.rb

@@ -4,7 +4,7 @@
 
 module DeadEnd
   RSpec.describe WhoDisSyntaxError do
-    it  "determines the type of syntax error" do
+    it "determines the type of syntax error to be an unmatched end" do
       expect(
         WhoDisSyntaxError.new("def foo;").call.error_symbol
       ).to eq(:missing_end)
@@ -18,7 +18,7 @@ module DeadEnd
       ).to eq(:end)
     end
 
-    it "" do
+    it "determines the type of syntax error to be an unmatched pipe" do
       source = <<~EOM
         class Blerg
           Foo.call do |a
@@ -38,5 +38,28 @@ class Foo
         DeadEnd.invalid_type(source).unmatched_symbol
       ).to eq(:|)
     end
+
+    it "determines the type of syntax error to be an unmatched bracket" do
+      source = <<~EOM
+        module Hey
+          class Foo
+            def initialize
+              [1,2,3
+            end
+
+            def call
+            end
+          end
+        end
+      EOM
+
+      expect(
+        DeadEnd.invalid_type(source).error_symbol
+      ).to eq(:unmatched_syntax)
+
+      expect(
+        DeadEnd.invalid_type(source).unmatched_symbol
+      ).to eq(:"]")
+    end
   end
 end