unsupported or misplaced expression error from match!

[tpapp]

I am investigating this issue JuliaData/CSV.jl#359, which I think comes from Parsers.jl. When running tests on both the released version and master of Parsers.jl on Julia master (currently v"1.1.0-DEV.794"), I get many errors of the form

Misc: Error During Test at /home/tamas/.julia/dev/Parsers/test/runtests.jl:596
  Got exception outside of a @test
  unsupported or misplaced expression error
  Stacktrace:
   [1] top-level scope
   [2] match! at /home/tamas/.julia/dev/Parsers/src/tries.jl:137 [inlined]
   [3] #parse!#25 at /home/tamas/.julia/dev/Parsers/src/Parsers.jl:588 [inlined]
   [4] parse! at /home/tamas/.julia/dev/Parsers/src/Parsers.jl:578 [inlined]
   [5] #parse!#23 at /home/tamas/.julia/dev/Parsers/src/Parsers.jl:508 [inlined]
   [6] parse! at /home/tamas/.julia/dev/Parsers/src/Parsers.jl:483 [inlined]
   [7] #parse!#22 at /home/tamas/.julia/dev/Parsers/src/Parsers.jl:384 [inlined]
   [8] parse! at /home/tamas/.julia/dev/Parsers/src/Parsers.jl:384 [inlined]
   [9] #parse#11 at /home/tamas/.julia/dev/Parsers/src/Parsers.jl:305 [inlined]
   [10] parse(::Parsers.Delimited{false,false,Parsers.Quoted{Parsers.Sentinel{typeof(Parsers.defaultparser),Parsers.Trie{0x00,false,missing,2,Tuple{Parsers.Trie{0x6e,false,missing,2,Tuple{Parsers.Trie{0x75,false,missing,2,Tuple{Parsers.Trie{0x6c,false,missing,2,Tuple{Parsers.Trie{0x6c,true,missing,2,Tuple{}}}}}}}}}}}},Parsers.Trie{0x00,false,missing,8,Tuple{Parsers.Trie{0x2c,true,missing,8,Tuple{}}}}}, ::Base.GenericIOBuffer{Array{UInt8,1}}, ::Type{Int64}) at /home/tamas/.julia/dev/Parsers/src/Parsers.jl:305
   [11] top-level scope at /home/tamas/.julia/dev/Parsers/test/runtests.jl:634
   [12] top-level scope at /home/tamas/src/julia-git/usr/share/julia/stdlib/v1.1/Test/src/Test.jl:1083
   [13] top-level scope at /home/tamas/.julia/dev/Parsers/test/runtests.jl:598
   [14] top-level scope at /home/tamas/src/julia-git/usr/share/julia/stdlib/v1.1/Test/src/Test.jl:1083
   [15] top-level scope at /home/tamas/.julia/dev/Parsers/test/runtests.jl:7
   [16] include at ./boot.jl:317 [inlined]
   [17] include_relative(::Module, ::String) at ./loading.jl:1038
   [18] include(::Module, ::String) at ./sysimg.jl:29
   [19] include(::String) at ./client.jl:403
   [20] top-level scope at none:0
   [21] eval(::Module, ::Any) at ./boot.jl:319
   [22] exec_options(::Base.JLOptions) at ./client.jl:243
   [23] _start() at ./client.jl:436

Julia 1.0.2 works fine. Manifest.toml below.

[tpapp]

[[Base64]]
uuid = "2a0f44e3-6c83-55bd-87e4-b1978d98bd5f"

[[Dates]]
deps = ["Printf"]
uuid = "ade2ca70-3891-5945-98fb-dc099432e06a"

[[Distributed]]
deps = ["LinearAlgebra", "Random", "Serialization", "Sockets"]
uuid = "8ba89e20-285c-5b6f-9357-94700520ee1b"

[[InteractiveUtils]]
deps = ["Markdown"]
uuid = "b77e0a4c-d291-57a0-90e8-8db25a27a240"

[[Libdl]]
uuid = "8f399da3-3557-5675-b5ff-fb832c97cbdb"

[[LinearAlgebra]]
deps = ["Libdl"]
uuid = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"

[[Logging]]
uuid = "56ddb016-857b-54e1-b83d-db4d58db5568"

[[Markdown]]
deps = ["Base64"]
uuid = "d6f4376e-aef5-505a-96c1-9c027394607a"

[[Missings]]
deps = ["Dates", "InteractiveUtils", "SparseArrays", "Test"]
git-tree-sha1 = "adc26d2ee85a49c413464110d922cf21efc9d233"
uuid = "e1d29d7a-bbdc-5cf2-9ac0-f12de2c33e28"
version = "0.3.1"

[[Printf]]
deps = ["Unicode"]
uuid = "de0858da-6303-5e67-8744-51eddeeeb8d7"

[[Random]]
deps = ["Serialization"]
uuid = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"

[[Serialization]]
uuid = "9e88b42a-f829-5b0c-bbe9-9e923198166b"

[[Sockets]]
uuid = "6462fe0b-24de-5631-8697-dd941f90decc"

[[SparseArrays]]
deps = ["LinearAlgebra", "Random"]
uuid = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"

[[Test]]
deps = ["Distributed", "InteractiveUtils", "Logging", "Random"]
uuid = "8dfed614-e22c-5e08-85e1-65c5234f0b40"

[[Unicode]]
uuid = "4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5"

[[WeakRefStrings]]
deps = ["Missings", "Random", "Test"]
git-tree-sha1 = "1087e8be380f2c8b96434b02bb1150fc1c511135"
uuid = "ea10d353-3f73-51f8-a26c-33c1cb351aa5"
version = "0.5.3"

[tpapp]

I can also replicate this in a clean environment, eg

mkdir /tmp/clean; JULIA_DEPOT_PATH=/tmp/clean julia --project=/tmp/clean

then

pkg> add Parsers
pkg> test Parsers

also on latest master 1.1.0-DEV.821.

[quinnj]

Should be fixed by d236f02