diff --git a/src/parser_api.jl b/src/parser_api.jl
index 68d6baf6..ffc6538f 100644
--- a/src/parser_api.jl
+++ b/src/parser_api.jl
@@ -20,9 +20,6 @@ function Base.showerror(io::IO, err::ParseError)
     show_diagnostics(io, err.diagnostics, err.source)
 end
 
-Base.display_error(io::IO, err::ParseError, bt) = Base.showerror(io, err, bt)
-
-
 """
     parse!(stream::ParseStream; rule=:all)
 
diff --git a/src/syntax_tree.jl b/src/syntax_tree.jl
index 76c4e3d6..e8ce3a50 100644
--- a/src/syntax_tree.jl
+++ b/src/syntax_tree.jl
@@ -7,6 +7,14 @@ mutable struct TreeNode{NodeData}   # ? prevent others from using this with Node
     parent::Union{Nothing,TreeNode{NodeData}}
     children::Union{Nothing,Vector{TreeNode{NodeData}}}
     data::Union{Nothing,NodeData}
+
+    # Use this constructor rather than the automatically generated one to pass
+    # Test.detect_unbound_args() test in Base.
+    function TreeNode{NodeData}(parent::Union{Nothing,TreeNode{NodeData}},
+                                children::Union{Nothing,Vector{TreeNode{NodeData}}},
+                                data::Union{Nothing,NodeData}) where {NodeData}
+        new{NodeData}(parent, children, data)
+    end
 end
 
 # Implement "pass-through" semantics for field access: access fields of `data`
diff --git a/src/tokenize.jl b/src/tokenize.jl
index cb31f746..7f54a980 100644
--- a/src/tokenize.jl
+++ b/src/tokenize.jl
@@ -1,6 +1,6 @@
 module Tokenize
 
-export tokenize, untokenize, Tokens
+export tokenize, untokenize
 
 using ..JuliaSyntax: JuliaSyntax, Kind, @K_str, @KSet_str
 
diff --git a/test/utils.jl b/test/utils.jl
index 227077f6..371da98c 100644
--- a/test/utils.jl
+++ b/test/utils.jl
@@ -15,3 +15,10 @@
     @test ps("XX", fgcolor=:red, bgcolor=:green, href="https://www.example.com") ==
         "\e]8;;https://www.example.com\e\\\e[31m\e[42mXX\e[0;0m\e]8;;\e\\"
 end
+
+@testset "ambiguities" begin
+    if VERSION >= v"1.8"
+        @test detect_ambiguities(JuliaSyntax) == []
+        @test detect_unbound_args(JuliaSyntax) == []
+    end
+end