JuliaDebug/Cthulhu.jl

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The slow descent into madness

Stars: 709
Forks: 46
Open beginner issues: 0
Indexed issues: 94
Avg merge: 1d 13h
Merged PRs (30d): 2

Dominant language: Julia
License: MIT
Last GitHub push: Aug 22, 2026
Latest indexed: Sep 18, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: help wanted good first issue

Beginner friendly Everything

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94 open issues indexed

TypedSyntax: a macro call inside an expression leaves the enclosing calls unmapped Open

Difficulty 3/5 1-2 days Newbie friendliness 65/100

JuliaDebug/Cthulhu.jl#712 · Opened Sep 16, 2026
TypedSyntax: `ccall` argument conversions are attributed to the argument-type tuple Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

JuliaDebug/Cthulhu.jl#711 · Opened Sep 16, 2026
TypedSyntax: `val = f(@inbounds A[j])` maps the call to the assignment target `val` Open

Difficulty 3/5 1-2 days Newbie friendliness 66/100

JuliaDebug/Cthulhu.jl#710 · Opened Sep 16, 2026
Colours don't work in Julia 1.12 Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

JuliaDebug/Cthulhu.jl#701 · 1 reaction · Opened Mar 28, 2026
"UndefVarError: `ConstPropResult` not defined in `Compiler`" when pre-compiling Cthulhu Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

JuliaDebug/Cthulhu.jl#698 · 1 comment · Opened Mar 5, 2026
VSCode-only ERROR: unhandled `Compiler.CallInfo` of type Compiler.VirtualMethodMatchInfo" Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#696 · Opened Feb 28, 2026
Cthulhu should display ambiguous method matches Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

JuliaDebug/Cthulhu.jl#695 · Opened Feb 26, 2026
Missing call sites Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

JuliaDebug/Cthulhu.jl#694 · Opened Feb 20, 2026
MethodError in TypedSyntax Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#693 · 1 comment · 1 reaction · Opened Feb 5, 2026
`AssertionError: isdefined(cache[mi], :inferred)` on julia nightly for some functions Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

JuliaDebug/Cthulhu.jl#691 · 1 comment · Opened Dec 11, 2025
Error when descending into function Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#690 · Opened Dec 10, 2025
Print `code_typed`-friendly signature for the current frame Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#689 · 2 comments · Opened Dec 9, 2025
Cannot descend into function without revising Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#688 · 1 comment · Opened Dec 9, 2025
Support running with the existing CI cache? Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

JuliaDebug/Cthulhu.jl#670 · 1 reaction · Opened Sep 15, 2025
`MethodError: no method matching cthulhu_typed` on julia nightly Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#669 · 1 comment · 1 reaction · Opened Sep 14, 2025
`descend(Base.show_unquoted, ...)` fails Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

JuliaDebug/Cthulhu.jl#664 · Opened Aug 23, 2025
`descend` results disagree with `code_typed` Open

Difficulty 4/5 3-5 days Newbie friendliness 32/100

JuliaDebug/Cthulhu.jl#663 · 4 comments · 1 reaction · Opened Aug 22, 2025
Errors with TypedSyntax Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#653 · 3 comments · Opened Jul 17, 2025
TypeError upon descending into a dynamic call Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#651 · 1 comment · Opened Jul 14, 2025
Define a low-level interface to support non-standard compilation Open

JuliaDebug/Cthulhu.jl#648 · 1 comment · 2 reactions · 1 assignee · Opened Jun 20, 2025
upgrading from v2.16 to v2.17 causes `ERROR: expected tuple type` Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

JuliaDebug/Cthulhu.jl#632 · Opened Mar 28, 2025
Allow user to step into failing generator Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#617 · Opened Feb 13, 2025
Typed syntax output showing type unstable result as type stable? Open

bug TypedSyntax

Difficulty 3/5 1-2 days Newbie friendliness 45/100

JuliaDebug/Cthulhu.jl#599 · Opened Sep 18, 2024
`@descend` first takes a long time, then when selecting a function, throws `TypeError: in typeassert, expected Vector{Any}, got a value of type Nothing` Open

bug TypedSyntax

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#598 · 1 comment · Opened Sep 18, 2024
TypeError: in typeassert, expected Union{JuliaSyntax.TreeNode{TypedSyntax.TypedSyntaxData}, JuliaSyntax.SyntaxNode}, got a value of type Nothing Open

bug TypedSyntax

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#584 · Opened Jul 31, 2024
Issues with the current `ascend` extension interface Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

JuliaDebug/Cthulhu.jl#582 · Opened Jul 28, 2024
Proposal: split test/FakeTerminals.jl out into its own package Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#581 · Opened Jul 27, 2024
Better (or at least larger) callstack browser? Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 30/100

JuliaDebug/Cthulhu.jl#571 · 1 comment · Opened May 15, 2024
Use depth-limited type printing, from Julia 1.10 Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 25/100

JuliaDebug/Cthulhu.jl#566 · 13 comments · Opened Apr 19, 2024
Keyword `interactive` kw does not exist in `code_warntype`, as suggested Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

JuliaDebug/Cthulhu.jl#561 · Opened Mar 29, 2024
Program Slice View Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

JuliaDebug/Cthulhu.jl#550 · 1 reaction · Opened Feb 27, 2024
Show Inlay Hints in VSCode for all open files Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#536 · 2 reactions · Opened Jan 17, 2024
Allow user to overload printing behavior Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#535 · 2 comments · 2 reactions · Opened Jan 17, 2024
Display certain unions with `Base.warn_color()` to match `code_warntype` Open

enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

JuliaDebug/Cthulhu.jl#533 · 1 comment · Opened Jan 11, 2024
Different type annotations when function is defined once on Julia nightly Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#530 · 2 comments · Opened Jan 8, 2024
Incorrectly positioned type assertion Open

bug TypedSyntax

Difficulty 3/5 1-2 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#521 · Opened Dec 14, 2023
Cthulhu should be better friends with GPUCompiler Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

JuliaDebug/Cthulhu.jl#510 · Opened Oct 16, 2023
[Feature request] Noinline Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 32/100

JuliaDebug/Cthulhu.jl#509 · 1 comment · Opened Oct 10, 2023
internal bug with print_callsite_info Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

JuliaDebug/Cthulhu.jl#505 · 1 comment · Opened Sep 14, 2023
missing error handling in descend entry for non-types Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#503 · Opened Sep 14, 2023
Run in Jupyter labs as well as REPL Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

JuliaDebug/Cthulhu.jl#502 · 1 comment · Opened Sep 11, 2023
Handling invokelatest Open

Difficulty 4/5 3-5 days Newbie friendliness 28/100

JuliaDebug/Cthulhu.jl#501 · Opened Sep 9, 2023
Differences between `descend_code_warntype` and `code_warntype` in presence of recursion Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#500 · 1 comment · Opened Sep 7, 2023
Tests run until they timeout if theres a failure Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

JuliaDebug/Cthulhu.jl#496 · Opened Sep 3, 2023
Limit printing of Consts Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

JuliaDebug/Cthulhu.jl#489 · 6 comments · Opened Aug 22, 2023
Issue warning when the function may be generated by metaprogramming Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

JuliaDebug/Cthulhu.jl#486 · 1 comment · Opened Aug 20, 2023
Variable with two different type-annotations in a function Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#480 · Opened Aug 7, 2023
`TypeError: in typeassert, expected Vector{Any}, got a value of type Nothing` in `gettyp` Open

Difficulty 4/5 3-5 days Newbie friendliness 28/100

JuliaDebug/Cthulhu.jl#479 · Opened Aug 6, 2023
Incorrect printing of types with source code Open

bug TypedSyntax

Difficulty 3/5 1-2 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#473 · 1 comment · Opened Jun 19, 2023
Feature request: only print types once in an expression Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

JuliaDebug/Cthulhu.jl#466 · Opened Jun 13, 2023

JuliaDebug/Cthulhu.jl

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