IronLanguages / IronLanguages/ironpython3

Applying for-in structure in 'yield from' crashes ironpython.

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Description

See the following 'test.py', we define a function, in which we use yield from to handle a for-in structure. Ironpython(main branch) crashes. This works well on CPython 3.9.0

test.py

def test(b):
    obj = range(10)
    yield from (b for x in range(10))

Error message:

>>'ironpython/ironpython3/bin/Debug/net6.0/ipy' test.py
.........
   at Microsoft.Scripting.Hosting.Shell.CommandLine.Run(ScriptEngine engine, IConsole console, ConsoleOptions options) in /home/xxm/Desktop/IFuzzer/experiment_on_different_interpreter/ironpython/ironpython3/Src/DLR/Src/Microsoft.Dynamic/Hosting/Shell/CommandLine.cs:line 100
   at Microsoft.Scripting.Hosting.Shell.ConsoleHost.RunCommandLine() in /home/xxm/Desktop/IFuzzer/experiment_on_different_interpreter/ironpython/ironpython3/Src/DLR/Src/Microsoft.Dynamic/Hosting/Shell/ConsoleHost.cs:line 386
   at Microsoft.Scripting.Hosting.Shell.ConsoleHost.ExecuteInternal() in /home/xxm/Desktop/IFuzzer/experiment_on_different_interpreter/ironpython/ironpython3/Src/DLR/Src/Microsoft.Dynamic/Hosting/Shell/ConsoleHost.cs:line 321
   at PythonConsoleHost.ExecuteInternal() in /home/xxm/Desktop/IFuzzer/experiment_on_different_interpreter/ironpython/ironpython3/Src/IronPythonConsole/Console.cs:line 165
   at Microsoft.Scripting.Hosting.Shell.ConsoleHost.Execute() in /home/xxm/Desktop/IFuzzer/experiment_on_different_interpreter/ironpython/ironpython3/Src/DLR/Src/Microsoft.Dynamic/Hosting/Shell/ConsoleHost.cs:line 299
   at Microsoft.Scripting.Hosting.Shell.ConsoleHost.Run(String[] args) in /home/xxm/Desktop/IFuzzer/experiment_on_different_interpreter/ironpython/ironpython3/Src/DLR/Src/Microsoft.Dynamic/Hosting/Shell/ConsoleHost.cs:line 197
   at PythonConsoleHost.Main(String[] args) in /home/xxm/Desktop/IFuzzer/experiment_on_different_interpreter/ironpython/ironpython3/Src/IronPythonConsole/Console.cs:line 199
Aborted (core dumped)

System info:
ironpython3-debug(main branch):IronPython 3.4.0b1 DEBUG (3.4.0.0010)[.NETCoreApp,Version=v6.0 on .NET 6.0.11 (64-bit)] on linux
operating system: Ubuntu 18.04.6 LTS

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the crash with the reported test.py on IronPython's main branch and compare it with CPython 3.9. Use the stack trace through the DLR command-line runner as the initial entry point, then locate the yield-from and generator-expression handling. Done means this example runs without aborting and has a regression test.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp, python
Domain
compilers
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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