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Fix world age problems when running tests #41

Merged
merged 19 commits into from
Feb 18, 2019
Merged

Fix world age problems when running tests #41

merged 19 commits into from
Feb 18, 2019

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timholy
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@timholy timholy commented Feb 15, 2019

This WiP solves the world age problems by an inversion of control: rather than having lower_incrementally(f, mod, expr) recurse into expr, lower its individual pieces, and then running the resulting frames with f, this redesigns prepare_toplevel so that it splits expr into frames and returns it as a task list. The caller is then responsible for running each of them. While this is extra work for the caller, the big advantage is that if you do this in top-level you can ensure that there is a world age update after each new method definition. (This is achieved just by returning "prematurely" after each 3-arg :method expr is encountered.)

The core tests pass, but I'm having surprising difficulty rewriting juliatests.jl to use this. I may have to pivot to other things for the remainder of the day, so please don't merge yet. (I did want people to know this is coming---it's a pretty disruptive change.)

Bonus: includes new docs!

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codecov-io commented Feb 15, 2019

Codecov Report

Merging #41 into master will not change coverage.
The diff coverage is 0%.

Impacted file tree graph

@@          Coverage Diff          @@
##           master    #41   +/-   ##
=====================================
  Coverage       0%     0%           
=====================================
  Files           6      6           
  Lines        1115   1117    +2     
=====================================
- Misses       1115   1117    +2
Impacted Files Coverage Δ
src/precompile.jl 0% <ø> (ø) ⬆️
src/JuliaInterpreter.jl 0% <0%> (ø) ⬆️
src/interpret.jl 0% <0%> (ø) ⬆️
src/builtins.jl 0% <0%> (ø) ⬆️

Continue to review full report at Codecov.

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@KristofferC
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Is is true that theoretically, we could just invokelatest every function? In that case, perhaps it should be mentioned why we don't do that.

@timholy
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timholy commented Feb 15, 2019

That was indeed the old bandaid, you can find such a call in lower!. But that became not-very-viable when I discovered that I'd also need it on calls in maybe_evaluate_builtin: it would make the interpreter insanely slow. Since this is an issue that affects the test suite much more than ordinary usage via @interpret foo(args...), I thought it was better to isolate the pain.

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Yeah, I didn't mean to suggest it as a workaround but just having a note about it in the docs to immediately catch the people going "oh they don't know about invokelatest to get around world error"-people.

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timholy commented Feb 15, 2019

Makes total sense, great idea.

@pfitzseb
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Maybe I'm missing something, but wouldn't it be possible to insert a manual world age increment after :method expressions?

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timholy commented Feb 15, 2019

I don't know how to do that, do you?

@pfitzseb
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I don't know how to do that, do you?

I don't -- turns out I didn't actually understand the problem properly (I thought the global world age wasn't incremented properly, but the problem is that the "local" world age is constant despite a new method being defined). So yeah, I can't think of a better way to do this.

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timholy commented Feb 16, 2019

@pfitzseb, I have long suspected that the omission of manual world-age updates is deliberate, but I hadn't really thought carefully until prompted by your question. Now my guess is this: if Julia supported manual updates, what would happen for a compiled function that happened to redefine itself and then trigger a world age update? Or a function that redefined one of its callers?

In contrast, if world age only updates when you are at top level, there is no caller (well, there's potentially eval_user_input, but this is a special case thats easily caught). So that situation can never arise.

Note that base "cheats" a bit on this: see, for example, https://github.com/JuliaLang/julia/blob/68db87147f9806db605c4df9f32b0869554cf4b7/src/interpreter.c#L883-L885. Since we can't do that, we have to employ other strategies.

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timholy commented Feb 16, 2019

I now have more of an idea of why I'm struggling with this. Check out this bizarre Julia bug:

...
    frame.pc[] = pc
    # Handle the return
    stmt = pc_expr(frame, pc)
    if nstmts == 0 && !isexpr(stmt, :return)
        println("aborted")
        JuliaInterpreter.show_stackloc(stack, frame, pc)
        @show pc frame
        ret = Aborted(frame, pc)
        @show ret
        return ret, nstmts
    end
...

and that Aborted constructor looks like this

function Aborted(frame::JuliaStackFrame, pc)
    println("Aborted constructor")
    @show pc frame
    lineidx = frame.code.code.codelocs[convert(Int, pc)]
    @show lineidx
    return Aborted(frame.code.code.linetable[lineidx])
end

yet I'm seeing output like

aborted
Main.JuliaTests
  Main.JuliaTests
    showerror(io::IO, ex::MethodError) in Base at errorshow.jl:168
      showerror_ambiguous(io::IO, meth, f, args) in Base at errorshow.jl:271
        print(io::IO, xs...) in Base at strings/io.jl:39
          print(io::IO, x) in Base at strings/io.jl:29
            show(io::IO, m::Method) in Base at methodshow.jl:113
              #show#520(kwtype::Union{Nothing, DataType}, ::Any, io::IO, m::Method) in Base at methodshow.jl:113
                arg_decl_parts(m::Method) in Base at methodshow.jl:55
                  argtype_decl(env, n, sig::DataType, i::Int64, nargs, isva::Bool) in Base at methodshow.jl:6
                    string_with_env(env, xs...) in Base at strings/io.jl:129
                      print(io::IO, x) in Base at strings/io.jl:29
                        show(io::IO, x::DataType) in Base at show.jl:436
                          show_datatype(io::IO, x::DataType) in Base at show.jl:511
                            show_type_name(io::IO, tn::Core.TypeName) in Base at show.jl:450
                              print(io::IO, s::Union{SubString{String}, String}) in Base at strings/io.jl:167
                                write(io::IO, s::Union{SubString{String}, String}) in Base at strings/io.jl:165
                                  unsafe_write(io::Base.AbstractPipe, p::Ptr{UInt8}, nb::UInt64) in Base at io.jl:225
                                    unsafe_write(to::Base.GenericIOBuffer, p::Ptr{UInt8}, nb::UInt64) in Base at iobuffer.jl:409
                                      getproperty(x, f::Symbol) in Base at sysimg.jl:18, pc = 2
pc = JuliaProgramCounter(2)
frame = JuliaStackFrame(JuliaInterpreter.JuliaFrameCode(getproperty(x, f::Symbol) in Base at sysimg.jl:18, CodeInfo(
1 ─      nothing
│   %2 = ($(QuoteNode(getfield)))(x, f)
└──      return %2
), #= stuff =#)
Aborted constructor
pc = JuliaProgramCounter(140359322445712)   # what?!? wasn't it at 2 moments ago?
frame = JuliaStackFrame(JuliaInterpreter.JuliaFrameCode(getproperty(x, f::Symbol) in Base at sysimg.jl:18, CodeInfo(
1 ─      nothing
│   %2 = ($(QuoteNode(getfield)))(x, f)
└──      return %2
...

@KristofferC
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Yikes 😨

@timholy timholy changed the title WIP: fix world age problems when running tests Fix world age problems when running tests Feb 16, 2019
@timholy
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timholy commented Feb 16, 2019

OK, this seems to work now, and adds in a fix for generated functions as a bonus. With this the tuple test finishes.

However, one negative is that this disables the parallel framework and runs all tests in id 1. Because of the tests that kill Julia, this means we don't finish them. I haven't yet looked into how to run these tests in top level on the workers (all the @async stuff goes through thunks, AFAIU). Maybe I need to eval them on the workers? Thoughts?

I'll point out another oddity in the code.

@test @interpret(isdefined(Toplevel, :Beat))
@test @interpret(Toplevel.Beat <: Toplevel.DatesMod.Period)
# @test @interpret(isdefined(Toplevel, :Beat))
# @test @interpret(Toplevel.Beat <: Toplevel.DatesMod.Period)
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Bizarrely, these seem to break the printing of the TestSet results. I haven't looked into the cause.

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timholy commented Feb 16, 2019

Dang, passed on a 2-day old master. I'll update and see what might need fixing.

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timholy commented Feb 16, 2019

Here's an update on the tests with this branch (I had to comment out the `@sync` wrapper and put in a `sleep(300)` to let still-running tests finish). It's not an unequivocal win, there are even some regressions. More work to do, I fear 😢. Julia Version 1.2.0-DEV.344 Commit a44b421138* (2019-02-16 16:52 UTC) Platform Info: OS: Linux (x86_64-linux-gnu) CPU: Intel(R) Xeon(R) CPU E5-2640 v3 @ 2.60GHz WORD_SIZE: 64 LIBM: libopenlibm LLVM: libLLVM-6.0.1 (ORCJIT, haswell) Environment: JULIA_CPU_THREADS = 8 Test run at: 2019-02-16T17:24:21.508

Maximum number of statements per lowered expression: 1000000

Test file Passes Fails Errors Broken Aborted blocks
ambiguous 62 0 0 2 0
subarray 278 0 1 0 1
strings/basic 7211 1 4 0 3
strings/search 522 0 0 0 0
strings/util 449 0 0 0 0
strings/io 40 0 0 0 1
strings/types X X X X X
unicode/utf8 19 0 0 0 0
core X X X X X
keywordargs X X X X X
numbers X X X X X
subtype X X X X X
char ☠️ ☠️ ☠️ ☠️ ☠️
triplequote 28 0 0 0 0
intrinsics 44 0 0 0 0
dict X X X X X
hashing X X X X X
iobuffer 151 0 0 0 1
staged X X X X X
offsetarray X X X X X
arrayops X X X X X
tuple 488 0 1 0 0
reduce 1413 0 3 0 4
reducedim X X X X X
abstractarray X X X X X
intfuncs 4364 0 15 0 1
simdloop 61 3 0 0 1
vecelement X X X X X
rational X X X X X
bitarray X X X X X
copy 493 11 7 0 0
math X X X X X
fastmath 907 3 3 0 0
functional X X X X X
iterators 601 0 4 0 2
operators 3758 0 0 0 1
path X X X X X
ccall X X X X X
parse X X X X X
loading X X X X X
bigint X X X X X
sorting 985 0 65 0 4
spawn X X X X X
backtrace X X X X X
exceptions 28 19 6 0 0
file X X X X X
read X X X X X
version 1134 0 0 0 1
namedtuple 161 0 8 1 0
mpfr 758 0 45 0 0
broadcast X X X X X
complex X X X X X
floatapprox 49 0 0 0 0
reflection X X X X X
regex 38 0 1 0 0
float16 124 0 0 0 0
combinatorics 92 0 3 0 1
sysinfo 2 0 0 0 0
env X X X X X
rounding X X X X X
ranges X X X X X
mod2pi 80 0 0 0 0
euler 4 0 4 0 4
show X X X X X
client 0 3 0 0 0
errorshow X X X X X
sets X X X X X
goto X X X X X
llvmcall X X X X X
llvmcall2 6 0 0 0 0
grisu 683 0 0 0 1
some 64 0 0 0 0
meta X X X X X
stacktraces X X X X X
docs X X X X X
misc X X X X X
threads X X X X X
enums X X X X X
cmdlineargs X X X X X
int X X X X X
checked X X X X X
bitset 192 0 0 0 0
floatfuncs 68 0 1 0 1
boundscheck X X X X X
error 31 0 0 0 0
cartesian 7 0 0 0 0
osutils 42 0 0 0 0
channels X X X X X
iostream 11 0 2 0 0
secretbuffer 17 0 0 0 0
specificity X X X X X
reinterpretarray 91 0 0 0 1
syntax X X X X X
logging X X X X X
missing X X X X X
asyncmap X X X X X
SparseArrays/higherorderfns X X X X X
SparseArrays/sparse X X X X X
SparseArrays/sparsevector X X X X X
Pkg/resolve X X X X X
LinearAlgebra/triangular X X X X X
LinearAlgebra/qr X X X X X
LinearAlgebra/dense X X X X X
LinearAlgebra/matmul X X X X X
LinearAlgebra/schur X X X X X
LinearAlgebra/special X X X X X
LinearAlgebra/eigen X X X X X
LinearAlgebra/bunchkaufman X X X X X
LinearAlgebra/svd X X X X X
LinearAlgebra/lapack X X X X X
LinearAlgebra/tridiag X X X X X
LinearAlgebra/bidiag X X X X X
LinearAlgebra/diagonal X X X X X
LinearAlgebra/cholesky X X X X X
LinearAlgebra/lu X X X X X
LinearAlgebra/symmetric X X X X X
LinearAlgebra/generic X X X X X
LinearAlgebra/uniformscaling X X X X X
LinearAlgebra/lq X X X X X
LinearAlgebra/hessenberg X X X X X
LinearAlgebra/blas X X X X X
LinearAlgebra/adjtrans X X X X X
LinearAlgebra/pinv X X X X X
LinearAlgebra/givens X X X X X
LinearAlgebra/structuredbroadcast X X X X X
LibGit2/libgit2 X X X X X
Dates/accessors X X X X X
Dates/adjusters X X X X X
Dates/query X X X X X
Dates/periods X X X X X
Dates/ranges X X X X X
Dates/rounding X X X X X
Dates/types X X X X X
Dates/io X X X X X
Dates/arithmetic X X X X X
Dates/conversions X X X X X
Base64 20 0 0 0 1
CRC32c 658 0 6 0 0
DelimitedFiles X X X X X
FileWatching X X X X X
Future 0 0 0 0 0
InteractiveUtils X X X X X
Libdl X X X X X
Logging 33 1 2 0 0
Markdown X X X X X
Mmap X X X X X
Printf X X X X X
Profile X X X X X
REPL 995 0 0 5 0
Random X X X X X
SHA X X X X X
Serialization X X X X X
Sockets X X X X X
Statistics X X X X X
SuiteSparse 778 0 0 0 0
Test X X X X X
UUIDs 22 0 0 0 0
Unicode ☠️ ☠️ ☠️ ☠️ ☠️

@timholy timholy mentioned this pull request Feb 17, 2019
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timholy commented Feb 17, 2019

OK, I think this is finally ready to merge. It's failing on nightly because of Debugger's tests; however, presumably Debugger won't pass on nightly without this (specifically, b1f7906). I won't merge right away in case @KristofferC wants to use this as a test case for https://github.com/JuliaLang/Pkg.jl/issues/770. (Unless committing the manifest is "the answer," in which case perhaps that can be closed.)

Among many other changes, this now has an interesting "fallback to Compiled" behavior here. This makes sure a test runs even if the interpreter gives up on it. Consequently we don't get failures like #30, You can still have problems if a test has done some work (e.g., printing to a buffer) but not finished; when you re-run it under Compiled that work will be repeated (which can cause some tests to fail). So this doesn't perfectly eliminate spurious faiilures, but it's getting closer. See #44 for discussion.

As a consequence, the tests take much longer to run than they used to.

Fixes #36. Fixes #30. Fixes #41

It's now a heck of a lot better, though clearly there's still some ways to go. Expand for results. However, I'm not entirely certain this is correct; for example, if I run them one-by-one I get the following for a selection of the tests that report as X in the big run below:

Test file Passes Fails Errors Broken Aborted blocks
offsetarray 352 0 0 0 3
reducedim 686 3 0 0 27
bigint 2155 0 1 0 18
sorting 4864 0 0 0 8

so there may be more passing than this suggests. Needs investigation.

Julia Version 1.2.0-DEV.344
Commit a44b421138* (2019-02-16 16:52 UTC)
Platform Info:
OS: Linux (x86_64-linux-gnu)
CPU: Intel(R) Xeon(R) CPU E5-2640 v3 @ 2.60GHz
WORD_SIZE: 64
LIBM: libopenlibm
LLVM: libLLVM-6.0.1 (ORCJIT, haswell)
Environment:
JULIA_CPU_THREADS = 8
Test run at: 2019-02-17T09:17:51.447

Maximum number of statements per lowered expression: 1000000

Test file Passes Fails Errors Broken Aborted blocks
ambiguous 62 0 0 2 0
subarray 280 0 1 0 1
strings/basic 87290 1 4 0 3
strings/search 522 0 0 0 0
strings/util 449 0 0 0 0
strings/io 12749 0 0 0 1
strings/types 2302685 0 3 0 4
unicode/utf8 19 0 0 0 0
core X X X X X
worlds ☠️ ☠️ ☠️ ☠️ ☠️
keywordargs 133 0 1 0 0
numbers 1518443 27 284 0 6
subtype X X X X X
char ☠️ ☠️ ☠️ ☠️ ☠️
triplequote 28 0 0 0 0
intrinsics 44 0 0 0 0
dict 144290 1 1 0 8
hashing X X X X X
iobuffer 200 0 0 0 1
staged 57 3 0 0 0
offsetarray X X X X X
arrayops ☠️ ☠️ ☠️ ☠️ ☠️
tuple 488 0 1 0 0
reduce 8465 0 3 0 4
reducedim X X X X X
abstractarray ☠️ ☠️ ☠️ ☠️ ☠️
intfuncs 4404 0 15 0 1
simdloop X X X X X
vecelement X X X X X
rational 97493 0 29 0 2
bitarray 899682 0 0 0 9
copy 493 11 7 0 0
math 1505698 0 48 0 5
fastmath 907 3 3 0 0
functional 95 0 0 0 0
iterators 1568 0 4 0 2
operators 12928 0 0 0 1
path 274 0 0 12 2
ccall X X X X X
parse 10281 20 1 0 1
loading 143633 289 1 0 10
bigint X X X X X
sorting X X X X X
spawn X X X X X
backtrace 5 9 12 1 0
exceptions 28 19 6 0 0
file X X X X X
read X X X X X
version 2468 0 0 0 1
namedtuple 161 0 8 1 0
mpfr 758 0 45 0 0
broadcast 416 0 7 0 2
complex 8249 0 1 2 1
floatapprox 49 0 0 0 0
reflection X X X X X
regex 38 0 1 0 0
float16 124 0 0 0 0
combinatorics 95 0 3 0 1
sysinfo 2 0 0 0 0
env X X X X X
rounding 112496 0 1 0 2
ranges 12108707 2 209 327749 7
mod2pi 80 0 0 0 0
euler 8 0 4 0 4
show X X X X X
client 0 3 0 0 0
errorshow X X X X X
sets 739 0 1 0 1
goto X X X X X
llvmcall X X X X X
llvmcall2 6 0 0 0 0
grisu X X X X X
some 64 0 0 0 0
meta X X X X X
stacktraces X X X X X
docs X X X X X
misc X X X X X
threads X X X X X
enums 84 3 3 0 0
cmdlineargs X X X X X
int 10545 0 184 0 1
checked 1102 0 9 0 0
bitset 192 0 0 0 0
floatfuncs 116 0 1 0 1
boundscheck X X X X X
error 31 0 0 0 0
cartesian 7 0 0 0 0
osutils 42 0 0 0 0
channels ☠️ ☠️ ☠️ ☠️ ☠️
iostream 11 0 2 0 0
secretbuffer 17 0 0 0 0
specificity X X X X X
reinterpretarray 128 0 0 0 1
syntax X X X X X
logging 117 2 0 0 0
missing 406 0 0 1 1
asyncmap X X X X X
SparseArrays/higherorderfns 7031 64 0 73 8
SparseArrays/sparse ☠️ ☠️ ☠️ ☠️ ☠️
SparseArrays/sparsevector 9884 0 1 0 5
Pkg/resolve 128 1 10 0 1
LinearAlgebra/triangular 33194 0 0 0 2
LinearAlgebra/qr ☠️ ☠️ ☠️ ☠️ ☠️
LinearAlgebra/dense 7692 0 14 0 7
LinearAlgebra/matmul X X X X X
LinearAlgebra/schur 390 0 0 0 1
LinearAlgebra/special 2863 0 0 0 6
LinearAlgebra/eigen 406 0 0 0 2
LinearAlgebra/bunchkaufman 5145 0 0 0 1
LinearAlgebra/svd X X X X X
LinearAlgebra/lapack ☠️ ☠️ ☠️ ☠️ ☠️
LinearAlgebra/tridiag 1222 0 0 0 2
LinearAlgebra/bidiag 1946 0 0 0 1
LinearAlgebra/diagonal 1619 0 0 0 2
LinearAlgebra/cholesky 2194 0 0 0 1
LinearAlgebra/lu 1182 0 3 0 1
LinearAlgebra/symmetric 2076 0 0 0 2
LinearAlgebra/generic 436 0 2 0 3
LinearAlgebra/uniformscaling X X X X X
LinearAlgebra/lq 1253 0 0 0 1
LinearAlgebra/hessenberg 40 0 0 0 0
LinearAlgebra/blas 628 0 0 0 1
LinearAlgebra/adjtrans 253 0 0 0 1
LinearAlgebra/pinv 288 0 0 0 1
LinearAlgebra/givens 1840 0 0 0 1
LinearAlgebra/structuredbroadcast 408 0 0 0 2
LibGit2/libgit2 57 0 80 0 0
Dates/accessors 7723858 0 0 0 4
Dates/adjusters 3147 0 0 0 4
Dates/query 988 0 0 0 0
Dates/periods 679 0 2 0 1
Dates/ranges 349123 0 0 0 5
Dates/rounding 296 0 0 0 0
Dates/types 169 0 2 0 0
Dates/io 100 22 166 0 0
Dates/arithmetic 318 0 0 0 0
Dates/conversions 160 0 0 0 0
Base64 1015 0 0 0 1
CRC32c 658 0 6 0 0
DelimitedFiles X X X X X
FileWatching X X X X X
Future 0 0 0 0 0
InteractiveUtils 96 3 7 0 4
Libdl X X X X X
Logging 35 1 0 0 1
Markdown X X X X X
Mmap ☠️ ☠️ ☠️ ☠️ ☠️
Printf 701 38 0 0 0
Profile 15 0 0 0 2
REPL 995 0 0 5 0
Random X X X X X
SHA X X X X X
Serialization X X X X X
Sockets X X X X X
Statistics 606 0 1 0 4
SuiteSparse 778 0 0 0 0
Test X X X X X
UUIDs 22 0 0 0 0
Unicode ☠️ ☠️ ☠️ ☠️ ☠️

Also fixes an issue in which next_until! failed to store the final pc.
This reworks prepare_toplevel so that it produces a list of frames
that can be executed in order. In conjunction with another
addition, through_methoddef_or_done!, one can run each frame sequentially
up to the point of a new method definition, after which control can
return to top-level. This allows the world age to update.

While this places more burden on the top-level evaluator (one
now requires a nest of two loops), this resolves the difficulties
with previous strategies. It fixes a test previously marked as broken.
Also adds some line number info in prepare_toplevel to assist testing
This avoids the need for a macroexpand in prepare_toplevel, and
therefore preserves the block organization of the original code.
This also fixes a bug in optimize! which would inappropriately
extract "inner methods" from :toplevel expressions.
Also fixes a bug when trying to run a :thunk expr in Compiled mode.
The problem here is that lowering can depend on the result of a previous
frame. Consider an example in Julia's test/offsetarray.jl:

    stuff
    module NewModule
    using Test

    atsign-test_throws blah blah
    end

That `atsign-test_throws` cannot be lowered until the `using Test` has
been executed inside `NewModule`.
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timholy commented Feb 18, 2019

I will merge this once tests pass.

@KristofferC
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Restarted test to pickup Debugger fix

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timholy commented Feb 18, 2019

There will be an output difference in the Debugger tests, but let's deal with that separately.

https://travis-ci.org/JuliaDebug/JuliaInterpreter.jl/jobs/494967019

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👍

@timholy timholy merged commit 7705307 into master Feb 18, 2019
@timholy timholy deleted the teh/world_age branch February 18, 2019 16:17
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timholy commented Feb 18, 2019

I've updated the table in #13. Also check out the note about the crashes:

ones that caused errors or process exit (note: with the possible exceptions of channels, worlds, and arrayops, it appears that most such errors are due to a single cause, #28; deleting this block and rebuilding Julia fixes them)

@timholy timholy mentioned this pull request Mar 5, 2019
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