fix assigning unpaired paren face to all unpared parens

Author: KristofferC

src/JuliaSyntaxHighlighting.jl

@@ -148,9 +148,9 @@ function paren_type(k::Kind)
 end
 
 mutable struct ParenDepthCounter
-    paren::UInt
-    bracket::UInt
-    curly::UInt
+    paren::Int
+    bracket::Int
+    curly::Int
 end
 
 ParenDepthCounter() =

test/runtests.jl

@@ -27,3 +27,8 @@ astr_sum1to8 = Base.AnnotatedString("sum(1:8)")
 
 # Check for string indexing issues
 @test Base.annotations(highlight(":π")) |> first |> first == 1:3
+
+# Test unpaired parentheses (issue #17)
+unpaired_parens = highlight("(())))")
+@test Base.annotations(unpaired_parens)[5].value == :julia_unpaired_parentheses
+@test Base.annotations(unpaired_parens)[6].value == :julia_unpaired_parentheses