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JakeChampion

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lang

Go · 1 star
trafficserver
Apache Traffic Server™ is a fast, scalable and extensible HTTP/1.1 and HTTP/2 compliant caching proxy server.

C++ · 0 stars

Beginner friendly Everything

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self-host checker: a `return` inside a value block is checked against the block's type, not the enclosing function's (native E002) Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

JakeChampion/lang#9828 · Opened Sep 20, 2026
coreutils: uid does not resolve to a user name on macOS, because /etc/passwd is not the account database there Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

JakeChampion/lang#9815 · Opened Sep 19, 2026
printf is 4x slower than GNU on a huge precision, and it is the slowest single run in the whole corpus Open

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

JakeChampion/lang#9812 · Opened Sep 19, 2026
coreutils: a tty case lost the last line of GNU's output, and the pty capture measures clean Open

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

JakeChampion/lang#9807 · Opened Sep 19, 2026
TCO does not fire once the frame owes a release after the call, so reference-typed tail recursion overflows the stack on native and the AST leg Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

JakeChampion/lang#9794 · 1 comment · Opened Sep 19, 2026
rename has no exchange flag, so mv --exchange is three renames rather than one Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

JakeChampion/lang#9784 · Opened Sep 19, 2026
A coreutils corpus case can write into the repository, and uniq's +N reading is why one does Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

JakeChampion/lang#9765 · Opened Sep 18, 2026
The AST lowering miscompiles the self-host compiler: the resulting binary out-of-bounds aborts on most modules, and nothing gates it Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

JakeChampion/lang#9763 · 1 comment · Opened Sep 18, 2026
TestSelfHostSemanticWholeCompilerX86_64: a one-byte self-compile divergence that does not reproduce Open

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

JakeChampion/lang#9737 · 1 comment · Opened Sep 18, 2026
Axis and rank algebra, and lowering recognized elementwise shapes to SIMD kernels Open

enhancement ir performance

Difficulty 5/5 Over a week Newbie friendliness 35/100

JakeChampion/lang#9735 · Opened Sep 18, 2026
Multidimensional arrays: shape, strides and offset, with structural operations as metadata Open

enhancement ir stdlib

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

JakeChampion/lang#9734 · Opened Sep 18, 2026
Ownership-aware materialization: reuse the buffer an `own` array hands over, and make it fip/fbip-visible Open

enhancement ir perceus performance

Difficulty 5/5 Over a week Newbie friendliness 35/100

JakeChampion/lang#9733 · Opened Sep 18, 2026
[epic] Array programming as a first-class optimization domain Open

epic ir performance roadmap stdlib tracking

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

JakeChampion/lang#9727 · 1 comment · Opened Sep 18, 2026
coreutils: 1,411 corpus cases fail on Darwin across 51 utilities Open

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

JakeChampion/lang#9714 · 5 comments · Opened Sep 18, 2026
A PR can merge on a CANCELLED CI run, which is how main went red for eight hours Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

JakeChampion/lang#9705 · 1 comment · Opened Sep 18, 2026
A chained `.with` allocates a box per evaluation in assignment position Open

bug perceus

Difficulty 4/5 3-5 days Newbie friendliness 55/100

JakeChampion/lang#9702 · Opened Sep 18, 2026
Self-host E068 does not pair an `fbip` struct-update spread with the `own` parameter it consumes Open

bug perceus

Difficulty 5/5 Over a week Newbie friendliness 38/100

JakeChampion/lang#9700 · 8 comments · Opened Sep 18, 2026
set_args: let a program replace its own argv, so a multicall dispatcher can shift it Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

JakeChampion/lang#9694 · Opened Sep 18, 2026
The SSA call-site alignment pad costs two instructions at 22% of call sites, and a frame slot would cost none Open

Difficulty 5/5 Over a week Newbie friendliness 42/100

JakeChampion/lang#9669 · 4 comments · Opened Sep 17, 2026
Self-host AST lowering miscompiles two returned capturing closures bound in one loop body — and -sanitize hides it Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

JakeChampion/lang#9657 · 2 comments · Opened Sep 17, 2026
The perf baseline is stale in both directions, and it is hiding real regressions Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

JakeChampion/lang#9647 · 1 comment · Opened Sep 17, 2026
coreutils: the parity corpus never runs on Darwin, so every target_os() == "darwin" branch is ungated Open

bug ci coreutils

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

JakeChampion/lang#9645 · 5 comments · Opened Sep 17, 2026
Where the SSA default flip stands: -5.7% code emitted, but two benchmarks retire more instructions, and int_loop costs 9 per iteration against the stack machine's 8 Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

JakeChampion/lang#9640 · 7 comments · Opened Sep 17, 2026
self-host: u8[] elements occupy 8-byte slots, so every byte-array copy moves 8x the bytes Open

bug coreutils ir performance self-host

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

JakeChampion/lang#9634 · Opened Sep 17, 2026
Native runs a defer BEFORE reading the return value when the returned binding is a record; both self-host lowerings run it after Open

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

JakeChampion/lang#9627 · Opened Sep 17, 2026
self-host: Map is an association list with a string compare per entry, where native lowers to core/map's hash table — 100x at 8k keys and doubling Open

bug coreutils native-convergence performance self-host stdlib

Difficulty 4/5 3-5 days Newbie friendliness 38/100

JakeChampion/lang#9608 · 1 comment · Opened Sep 17, 2026
E053 refuses every intrinsic from a `fip` function, including ones that are a single instruction or a compile-time constant Open

bug language-design perceus

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

JakeChampion/lang#9607 · 1 comment · Opened Sep 17, 2026
perceus: reading an array field inside the update that rewrites it defeats reuse — one full copy per read-modify-write Open

bug perceus

Difficulty 4/5 3-5 days Newbie friendliness 48/100

JakeChampion/lang#9605 · Opened Sep 17, 2026
[design] a `fip` function cannot update a struct at all: E048 and E053 each forbid the other's remedy Open

enhancement language-design perceus

Difficulty 5/5 Over a week Newbie friendliness 35/100

JakeChampion/lang#9602 · Opened Sep 17, 2026
FIP experiment 12 — write the FIP Application Architecture guide Open

enhancement perceus

Difficulty 5/5 Over a week Newbie friendliness 45/100

JakeChampion/lang#9594 · Opened Sep 17, 2026
FIP experiment 11 — FIP-friendly bounded collections experiment Open

enhancement perceus stdlib

Difficulty 5/5 Over a week Newbie friendliness 35/100

JakeChampion/lang#9593 · Opened Sep 17, 2026
FIP experiment 9 — FIP data-processing / ETL pipeline Open

enhancement perceus

Difficulty 5/5 Over a week Newbie friendliness 35/100

JakeChampion/lang#9591 · Opened Sep 17, 2026
FIP experiment 8 — FIP storage/page-cache simulation Open

enhancement perceus

Difficulty 5/5 Over a week Newbie friendliness 35/100

JakeChampion/lang#9590 · Opened Sep 17, 2026
FIP experiment 7 — bounded message broker / queue Open

enhancement perceus

Difficulty 5/5 Over a week Newbie friendliness 35/100

JakeChampion/lang#9589 · Opened Sep 17, 2026
FIP experiment 6 — real-time audio / DSP pipeline Open

enhancement perceus

Difficulty 5/5 Over a week Newbie friendliness 42/100

JakeChampion/lang#9588 · Opened Sep 17, 2026
FIP experiment 5 — fixed-memory game/simulation loop Open

enhancement perceus

Difficulty 5/5 Over a week Newbie friendliness 35/100

JakeChampion/lang#9587 · Opened Sep 17, 2026
FIP experiment 4 — FIP HTTP-like application pipeline Open

enhancement perceus

Difficulty 5/5 Over a week Newbie friendliness 35/100

JakeChampion/lang#9586 · Opened Sep 17, 2026
FIP experiment 3 — bounded in-memory key/value service core Open

enhancement perceus

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

JakeChampion/lang#9585 · Opened Sep 17, 2026
[epic] Test Fern FIP/FBIP as an architecture for predictable, high-performance applications Open

enhancement perceus

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

JakeChampion/lang#9582 · Opened Sep 17, 2026
Self-host: a user struct named like a generic's type parameter breaks instantiation Open

Difficulty 4/5 3-5 days Newbie friendliness 58/100

JakeChampion/lang#9577 · 1 comment · Opened Sep 17, 2026
Closure boxes leak, and the two compilers leak opposite shapes: native loses a loop-local capturing closure, the self-host loses one in a struct field Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

JakeChampion/lang#9576 · 8 comments · Opened Sep 17, 2026
A defer over a binding or a return type with no zero literal still drops its module to the AST lowering Open

Difficulty 5/5 Over a week Newbie friendliness 42/100

JakeChampion/lang#9575 · 1 comment · Opened Sep 17, 2026
The range desugar reaches every consumer, so irlower.lower_range_for is dead — and its lowering is the tighter one Open

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

JakeChampion/lang#9565 · Opened Sep 17, 2026
Every Map.iter() leaks its iterator box — the box has no refcount header, so nothing can free it Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

JakeChampion/lang#9562 · Opened Sep 17, 2026
x86_64ssa cannot build the coreutils: a duplicate .Lssa_mm_vec label, and no fn___method_Reader_stat emitter Open

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

JakeChampion/lang#9559 · 2 comments · Opened Sep 17, 2026
The self-host AST lowering never releases a tuple returned by a call, and loses what it holds Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

JakeChampion/lang#9556 · Opened Sep 17, 2026
Semantic-path corpus census: 82 of 587 conformance cases still fall back to the AST lowering, and what blocks each Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

JakeChampion/lang#9550 · 3 comments · Opened Sep 17, 2026
main is red: the IR-verify corpus sweep segfaults on the diag_e079 fixture, which is a refusal case Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

JakeChampion/lang#9544 · 2 comments · Opened Sep 17, 2026
E051 refuses a local at its LAST use at an `own` parameter, though the IR already moves it there — and does so today whenever the parameter is owned by inference instead Open

Difficulty 4/5 3-5 days Newbie friendliness 56/100

JakeChampion/lang#9541 · 3 comments · Opened Sep 17, 2026
A match decomposes and releases its scrutinee even when no arm takes a payload, so the checker cannot relax E050 there Open

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

JakeChampion/lang#9539 · Opened Sep 17, 2026

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