diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 961fa21..eda320f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,6 +22,9 @@ jobs:
         arch:
           - x64
           - x86
+        exclude:
+          - os: macOS-latest
+            arch: x86
     steps:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@v1
@@ -44,13 +47,3 @@ jobs:
       - uses: codecov/codecov-action@v1
         with:
           file: lcov.info
-  docs:
-    name: Documentation
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: julia-actions/julia-buildpkg@latest
-      - uses: julia-actions/julia-docdeploy@latest
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          DOCUMENTER_KEY: ${{ secrets.DOCUMENTER_KEY }}
diff --git a/README.md b/README.md
index 412c446..3247636 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,6 @@
 [![Build status](https://github.com/andrewcooke/ParserCombinator.jl/workflows/CI/badge.svg)](https://github.com/andrewcooke/ParserCombinator.jl/actions?query=workflow%3ACI+branch%3Amaster)
 [![Codecov](https://codecov.io/gh/andrewcooke/ParserCombinator.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/andrewcooke/ParserCombinator.jl)
 
-[![ParserCombinator](http://pkg.julialang.org/badges/ParserCombinator_0.3.svg)](http://pkg.julialang.org/?pkg=ParserCombinator&ver=0.3)
-[![ParserCombinator](http://pkg.julialang.org/badges/ParserCombinator_0.4.svg)](http://pkg.julialang.org/?pkg=ParserCombinator&ver=0.4)
-[![ParserCombinator](http://pkg.julialang.org/badges/ParserCombinator_0.5.svg)](http://pkg.julialang.org/?pkg=ParserCombinator&ver=0.5)
-
 
 # ParserCombinator
 
diff --git a/src/core/debug.jl b/src/core/debug.jl
index c1b4787..ba52ed8 100644
--- a/src/core/debug.jl
+++ b/src/core/debug.jl
@@ -71,13 +71,7 @@ MAX_RES = 50
 MAX_SRC = 10
 MAX_IND = 10
 
-if VERSION < v"0.4-"
-    shorten(s) = s
-else
-#   shorten(s) = replace(s, r"(?:[a-zA-Z]+\.)+([a-zA-Z]+)", s"\1")
-    shorten(s) = replace(s, r"(?:[a-zA-Z]+\.)+([a-zA-Z]+)" =>
-                         Base.SubstitutionString("\1"))
-end
+shorten(s) = replace(s, r"(?:[a-zA-Z]+\.)+([a-zA-Z]+)" => s"\1")
 
 function truncate(s::AbstractString, n=10)
     if length(s) <= n
@@ -135,7 +129,7 @@ function src(s::LineAt, i::LineIter; max=MAX_SRC)
         end
     end
 end
-   
+
 function debug(k::Debug{S}, e::Execute) where {S<:LineAt}
     @printf("%3d,%-3d:%s %02d %s%s->%s\n",
             e.iter.line, e.iter.column, src(k.source, e.iter), k.depth[end], indent(k), e.parent.name, e.child.name)
diff --git a/src/core/parsers.jl b/src/core/parsers.jl
index 457d57e..24b419e 100644
--- a/src/core/parsers.jl
+++ b/src/core/parsers.jl
@@ -149,7 +149,7 @@ function producer(c::Channel, k::Config, m::Matcher; debug=false)
                 end
             end
         end
-        
+
     catch x
         if (debug)
             println("debug was set, so showing error from inside task")
@@ -165,7 +165,7 @@ end
 
 # helper functions to generate the parsers from the above
 
-# these assume that any config construct takes a single source argument 
+# these assume that any config construct takes a single source argument
 # plus optional keyword args
 
 function make(config, source::S, matcher; debug=false, kargs...) where {S}
@@ -181,8 +181,17 @@ function make_all(config; kargs_make...)
 end
 
 function once(channel)
-    for result in channel
-        return result
+    try
+        for result in channel
+            return result
+        end
+    catch ex
+        # unwrap exception
+        if VERSION >= v"1.1"
+            ex isa TaskFailedException ? throw(first(first(Base.catch_stack(ex.task)))) : rethrow()
+        else
+            rethrow()
+        end
     end
     throw(ParserException("cannot parse"))
 end
diff --git a/test/REQUIRE b/test/REQUIRE
deleted file mode 100644
index e69de29..0000000
diff --git a/test/core/calc.jl b/test/core/calc.jl
index 2576348..3aaacc4 100644
--- a/test/core/calc.jl
+++ b/test/core/calc.jl
@@ -54,7 +54,6 @@ for (src, val) in [
                    ]
 #    @test_approx_eq calc(parse_dbg(src, Trace(all))[1]) val
     @test calc(parse_one(src, Trace(all))[1]) ≈ val
-    println("$src = $val")
 end
 
 for (src, ast, val) in
@@ -168,6 +167,4 @@ for i in 1:20
     end
 end
 
-println("calc ok")
-
 end
diff --git a/test/core/case.jl b/test/core/case.jl
index b8c7c2d..9a6d500 100644
--- a/test/core/case.jl
+++ b/test/core/case.jl
@@ -55,6 +55,4 @@ end
 # and we can see that Case calls Pattern, as expected; that the Pattern
 # returns foo; and that Case transforms that to Foo.
 
-println("case ok")
-
 end
diff --git a/test/core/debug.jl b/test/core/debug.jl
index 793490e..ae49121 100644
--- a/test/core/debug.jl
+++ b/test/core/debug.jl
@@ -22,6 +22,4 @@ debug, task = make(Debug, "123abc", grammar; delegate=NoCache)
 @test_throws ParserException once(task)
 @test debug.max_iter == 4
 
-println("debug ok")
-
 end
diff --git a/test/core/fix.jl b/test/core/fix.jl
index a2c3436..aaa9c90 100644
--- a/test/core/fix.jl
+++ b/test/core/fix.jl
@@ -57,10 +57,6 @@ for (src, v) in [
                    ]
 #    @test calc(parse_dbg(src, Trace(all))[1]) ≈ v
     @test calc(parse_one(src, Trace(all))[1]) ≈ v
-    println("$src = $v")
 end
 
-
-println("fix ok")
-
 end
diff --git a/test/core/names.jl b/test/core/names.jl
index 7dd1890..66f1b0a 100644
--- a/test/core/names.jl
+++ b/test/core/names.jl
@@ -8,6 +8,4 @@ end
 @test a.name == :a
 @test b.name == :b
 
-println("names ok")
-
 end
diff --git a/test/core/print.jl b/test/core/print.jl
index 5152589..3dca9ee 100644
--- a/test/core/print.jl
+++ b/test/core/print.jl
@@ -3,6 +3,4 @@
 println(Seq())
 println(e"a" + E"b" | p"c" > tuple)
 
-println("print ok")
-
 end
diff --git a/test/core/slow.jl b/test/core/slow.jl
index 03b9d91..05c7e15 100644
--- a/test/core/slow.jl
+++ b/test/core/slow.jl
@@ -31,6 +31,4 @@ end
 slow(3)
 #slow(7)  # not for travis!
 
-println("slow ok")
-
 end
diff --git a/test/core/sources.jl b/test/core/sources.jl
index 19d3674..eea34ce 100644
--- a/test/core/sources.jl
+++ b/test/core/sources.jl
@@ -28,6 +28,4 @@ line = Trace(p"(.|\n)+"[0:end] + Eos())
 @test parse_one("abc\n", line) == ["abc\n"]
 @test parse_one(LineSource("abc\n"), line) == ["abc\n"]
 
-println("sources ok")
-
 end
diff --git a/test/core/speed.jl b/test/core/speed.jl
index d8f36ca..df841a6 100644
--- a/test/core/speed.jl
+++ b/test/core/speed.jl
@@ -29,8 +29,8 @@ function run_type(n)
     println("types: $count")
 end
 
-type A end
-type B end
+struct A end
+struct B end
 
 function random_type()
     if rand(1:2) == 1
diff --git a/test/core/stack.jl b/test/core/stack.jl
index 5344df3..cb46d51 100644
--- a/test/core/stack.jl
+++ b/test/core/stack.jl
@@ -16,18 +16,18 @@ stack(0, 10)
 @time println(stack(0, 100_000))
 # stack limit is somewhere around 100,000 (certainly less than 200,000)
 
-abstract Msg
+abstract type Msg end
 
-type Call<:Msg
+struct Call <: Msg
     before::Function
     after::Function
     value::Int
 end
 
-type Return<:Msg
+struct Return <: Msg
     value::Int
 end
-   
+
 function inc(n, m)
     if n > m
         Return(n)
@@ -55,7 +55,7 @@ function trampoline(n, m)
     end
     n
 end
-    
+
 
 trampoline(0, 10)
 @time println(trampoline(0, 100_000))
diff --git a/test/core/tests.jl b/test/core/tests.jl
index d1be756..5d54896 100644
--- a/test/core/tests.jl
+++ b/test/core/tests.jl
@@ -68,7 +68,6 @@ for i in 1:10
         n = rand(0:4)
         s = repeat("a", n)
         m = match(r, s)
-        println("$lo $hi $s $r")
         if m === nothing
             @test_throws ParserException parse_one(s, Repeat(Equal("a"), lo, hi; greedy=greedy))
         else
@@ -104,6 +103,4 @@ for backtrack in (true, false)
           [3,0]]
 end
 
-println("tests ok")
-
 end
diff --git a/test/core/try.jl b/test/core/try.jl
index d1751ec..ef6c4e4 100644
--- a/test/core/try.jl
+++ b/test/core/try.jl
@@ -24,19 +24,14 @@ for parse in (parse_try, parse_try_cache, parse_try_dbg, parse_try_cache_dbg)
     end
     open("core/test1.txt", "r") do io
         result = parse(io, Try(p"[a-z]"[0:end] + e"m" > string))
-        println(result)
         @test result == Any["abcdefghijklm"]
     end
     open("core/test1.txt", "r") do io
         # multiple lines
         result = parse(io, Try(p"(.|\n)"[0:end] + e"5" > string))
-        println(result)
         @test result == Any["abcdefghijklmnopqrstuvwxyz\n012345"]
     end
     @test_throws ParserError{LineIter} parse("?", Alt!(p"[a-z]", p"\d", Error("not letter or number")))
 end
 
-
-println("try ok")
-
 end
diff --git a/test/dot/examples.jl b/test/dot/examples.jl
index bb0a241..dcffbb0 100644
--- a/test/dot/examples.jl
+++ b/test/dot/examples.jl
@@ -80,6 +80,4 @@ d1, d2 = d
 @test nodes(d2) == Set(["a", "b", "c", "d", "e"])
 @test edges(d2) == Set([("a","e"),("c","d"),("c","e"),("b","c"),("a","c"),("a","b")])
 
-println("examples ok")
-
 end
diff --git a/test/dot/fragments.jl b/test/dot/fragments.jl
index 04bc81d..272486c 100644
--- a/test/dot/fragments.jl
+++ b/test/dot/fragments.jl
@@ -40,30 +40,28 @@ str_one = D.str_one > D.unesc_join
 @test parse_one(":n", D.port)[1] == Port("n")
 @test parse_one(":A", D.port)[1] == Port(StringID("A"))
 
-@test parse_one("[a=b]", D.attr_list)[1] == 
+@test parse_one("[a=b]", D.attr_list)[1] ==
 Attribute[Attribute(StringID("a"), StringID("b"))]
-@test parse_one("[a=b c = d]", D.attr_list)[1] == 
-Attribute[Attribute(StringID("a"), StringID("b")), 
+@test parse_one("[a=b c = d]", D.attr_list)[1] ==
+Attribute[Attribute(StringID("a"), StringID("b")),
           Attribute(StringID("c"), StringID("d"))]
-@test parse_one("[a=b; c = d]", D.attr_list)[1] == 
-Attribute[Attribute(StringID("a"), StringID("b")), 
+@test parse_one("[a=b; c = d]", D.attr_list)[1] ==
+Attribute[Attribute(StringID("a"), StringID("b")),
           Attribute(StringID("c"), StringID("d"))]
-@test parse_one("[a=b,c=d][e=f]", D.attr_list)[1] == 
-Attribute[Attribute(StringID("a"), StringID("b")), 
+@test parse_one("[a=b,c=d][e=f]", D.attr_list)[1] ==
+Attribute[Attribute(StringID("a"), StringID("b")),
           Attribute(StringID("c"), StringID("d")),
           Attribute(StringID("e"), StringID("f"))]
 
-@test parse_one("a:b:c[d=e]", D.node_stmt)[1] == 
-Node(NodeID(StringID("a"), Port(StringID("b"), "c")), 
+@test parse_one("a:b:c[d=e]", D.node_stmt)[1] ==
+Node(NodeID(StringID("a"), Port(StringID("b"), "c")),
      Attribute[Attribute(StringID("d"), StringID("e"))])
 
 @test parse_one("a--b[c=d]", D.edge_stmt)[1] ==
-Edge(EdgeNode[NodeID(StringID("a")), NodeID(StringID("b"))], 
+Edge(EdgeNode[NodeID(StringID("a")), NodeID(StringID("b"))],
      Attribute[Attribute(StringID("c"), StringID("d"))])
 
 @test parse_one("graph [a=b]", D.attr_stmt)[1] ==
 GraphAttributes(Attribute[Attribute(StringID("a"), StringID("b"))])
 
-println("fragments ok")
-
 end
diff --git a/test/dot/subgraphs.jl b/test/dot/subgraphs.jl
index 189cadf..dae742a 100644
--- a/test/dot/subgraphs.jl
+++ b/test/dot/subgraphs.jl
@@ -44,6 +44,4 @@ graph {
 @test nodes(d) == Set(["a", "b", "c", "d"])
 @test edges(d) == Set([("a","b"),("a","c"),("a","d"),("b","c"),("b","d"),("c","d")])
 
-println("subgraphs ok")
-
 end
diff --git a/test/gml/10k-49963.jl b/test/gml/10k-49963.jl
index f50f96b..c4728b2 100644
--- a/test/gml/10k-49963.jl
+++ b/test/gml/10k-49963.jl
@@ -1,7 +1,6 @@
 
 @testset "10k-49963" begin
 
-println("10k-49963")
 s = open(s -> read(s, String), "gml/10k-49963.gml")
 parse_raw(s; debug=false)
 @time parse_raw(s; debug=false)
diff --git a/test/gml/celegansneural.jl b/test/gml/celegansneural.jl
index 5105f96..3a7ae22 100644
--- a/test/gml/celegansneural.jl
+++ b/test/gml/celegansneural.jl
@@ -1,7 +1,6 @@
 
 @testset "celegansneural" begin
 
-println("celegansneural")
 s = open(s -> read(s, String), "gml/celegansneural.gml")
 parse_dict(s; debug=false)
 @time x = parse_dict(s; debug=false)
diff --git a/test/gml/errors.jl b/test/gml/errors.jl
index 2188d1f..c7f16ec 100644
--- a/test/gml/errors.jl
+++ b/test/gml/errors.jl
@@ -14,12 +14,7 @@ for (text, msg) in [("a 1 ]", "Expected key"),
         end
     end
 
-    if VERSION < v"0.5-"
-        @test_throws ParserError parse_raw(text)
-    else
-        @test_throws ParserError{Int64} parse_raw(text)
-    end
-
+    @test_throws ParserError{Int} parse_raw(text)
 end
 
 
diff --git a/test/gml/polblogs.jl b/test/gml/polblogs.jl
index 9747da6..c4ac68b 100644
--- a/test/gml/polblogs.jl
+++ b/test/gml/polblogs.jl
@@ -14,7 +14,6 @@
 #io = open("gml/polblogs.gml")
 #@time parse_id_dict(io; debug=false)
 
-println("polblogs")
 s = open(s -> read(s, String), "gml/polblogs.gml")
 x = parse_dict(s; debug=false)
 @test length(x[:graph][1][:edge]) == 19090