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Joseph Ferano a431cddd3b A divide by zero names the file and the line, and is answerable 
Three arithmetic situations had no defined behaviour and the two backends
disagreed about all three: a divide or remainder by zero, which was a raw
SIGFPE with no message and no location; (/ min -1), whose quotient is one past
the top of the type; and a float to integer cast whose value does not fit,
which LLVM called undefined and would fold to anything.

They now signal ArithError with `error`, exactly as a bad index signals
BoundsError, and die with a sentence naming the file, the line and the operands
only if nothing answered. The guards ride the same --checks flag as the bounds
check and are elided with it.

No restart is established at the failing operation. The sketch this started
from asked for use-value, and the implementation ruled it out: a restart frame
is allocated by the restart-case that offers it, on its own stack, so the
runtime cannot hold one on a program's behalf and use-value here would mean an
alloca and a restart frame at every division in every checked build. That is
the cost already refused for indexing, buying a silently different answer.

The x86 backend is unchanged and is the next commit.
2026-09-13 22:55:26 +07:00
..
assets
Assets are baked in at compile time, one file or one whole directory
2026-09-12 11:36:01 +07:00
pkgs
Macros come from a package now, and the refusal's reason was wrong
2026-09-13 15:40:08 +07:00
agent-longname.flan
Sweep every field label from the colon spelling to the dot
2026-09-12 14:47:54 +07:00
agent-queue.flan
Two of the four buffers with no evidence now have some
2026-09-12 10:47:41 +07:00
agent.flan
Retire the per-type printers, since print says all of it
2026-09-12 05:32:25 +07:00
algorithms.flan
The prelude's per-type families collapse: 22 functions become 10, 27 become 16
2026-09-13 14:49:11 +07:00
allocators.flan
Allocator is a builtin opaque type, so the arena needs nothing from milestone 5
2026-09-12 10:55:18 +07:00
arith-condition.flan
A divide by zero names the file and the line, and is answerable
2026-09-13 22:55:26 +07:00
arith.flan
A divide by zero names the file and the line, and is answerable
2026-09-13 22:55:26 +07:00
array-ctor.flan
A let binding has no type slot, so (array 4 T) is how you say it
2026-09-12 21:48:08 +07:00
bounds-condition.flan
A bad index stops the program where it stands instead of taking the session with it
2026-09-13 08:02:22 +07:00
bounds.flan
A pointer from C can state its length, and then it is a slice
2026-09-13 17:40:59 +07:00
break.flan
Sweep every field label from the colon spelling to the dot
2026-09-12 14:47:54 +07:00
bytes2.flan
Every defn in the tree states its return type, and Unit is written ()
2026-09-12 23:06:40 +07:00
cleanup.flan
Every defn in the tree states its return type, and Unit is written ()
2026-09-12 23:06:40 +07:00
conditions.flan
The return type stops being a guess: the slot is mandatory, unit is ()
2026-09-12 23:18:28 +07:00
debug-permuted.flan
Sweep every field label from the colon spelling to the dot
2026-09-12 14:47:54 +07:00
debug.flan
Sweep every field label from the colon spelling to the dot
2026-09-12 14:47:54 +07:00
defer-let.flan
Every defn in the tree states its return type, and Unit is written ()
2026-09-12 23:06:40 +07:00
destructure.flan
Every defn in the tree states its return type, and Unit is written ()
2026-09-12 23:06:40 +07:00
dev-break-bounds.flan
The break loop meets a bad index, and the test says so rather than the reasoning
2026-09-13 08:11:57 +07:00
dev-break.flan
Sweep every field label from the colon spelling to the dot
2026-09-12 14:47:54 +07:00
dev-globals.flan
The globals a stopped stack reaches, in one section and not under a frame
2026-09-12 16:22:58 +07:00
dev-inspect.flan
Which frame the inspector answered from, asserted rather than reasoned about
2026-09-12 20:34:32 +07:00
dev-locals.flan
Sweep every field label from the colon spelling to the dot
2026-09-12 14:47:54 +07:00
dev-loop.flan
Sweep every field label from the colon spelling to the dot
2026-09-12 14:47:54 +07:00
dev-noagent.flan
Memcheck is told an arena reset happened, and the agentless session is pinned
2026-09-13 17:55:00 +07:00
dev-pause.flan
A pause is waited for by name, and a build is not a socket
2026-09-13 13:07:25 +07:00
dev-ptr.flan
An address answers with a type, and a killed program is asked rather than hooked
2026-09-13 15:27:31 +07:00
dev-repl.flan
A stopped program, driven from Emacs
2026-09-11 19:39:29 +07:00
dev-robust.flan
A failed build is a refusal, and a refusal leaves the session standing
2026-09-13 19:43:18 +07:00
dev-watch.flan
A hot loop keeps five numbers, and the window is the editor's
2026-09-13 10:35:20 +07:00
edn.flan
Every defn in the tree states its return type, and Unit is written ()
2026-09-12 23:06:40 +07:00
embed.flan
Assets are baked in at compile time, one file or one whole directory
2026-09-12 11:36:01 +07:00
enum-compare.flan
Sweep every field label from the colon spelling to the dot
2026-09-12 14:47:54 +07:00
enum-convert.flan
An enum and an integer convert, both ways, when you say so
2026-09-12 09:11:34 +07:00
error.flan
Sweep every field label from the colon spelling to the dot
2026-09-12 14:47:54 +07:00
exhausted-unhandled.flan
(Vec T) over a type-erased runtime, with StorageExhausted going in beside it
2026-09-12 11:07:57 +07:00
exhausted.flan
The return type stops being a guess: the slot is mandatory, unit is ()
2026-09-12 23:18:28 +07:00
fn-capture.flan
A bare name is the function, and capture is the part that is not built
2026-09-12 22:44:33 +07:00
fn-extern.flan
A bare name is the function, and capture is the part that is not built
2026-09-12 22:44:33 +07:00
fn-in-struct.flan
A bare name is the function, and capture is the part that is not built
2026-09-12 22:44:33 +07:00
fn-no-type.flan
A bare name is the function, and capture is the part that is not built
2026-09-12 22:44:33 +07:00
fn-values.flan
The prelude's per-type families collapse: 22 functions become 10, 27 become 16
2026-09-13 14:49:11 +07:00
format.flan
Every defn in the tree states its return type, and Unit is written ()
2026-09-12 23:06:40 +07:00
frame-rollback.flan
An abandoned frame rolls back, and restore goes after the defers
2026-09-13 12:44:02 +07:00
free-all-refused.flan
Say what the two one-line refusal programs are refusing, and why
2026-09-12 11:15:58 +07:00
generic-map-reject.flan
The map operations are deferred, and the clause is what pays for it
2026-09-13 15:23:37 +07:00
generic-reject.flan
The prelude's per-type families collapse: 22 functions become 10, 27 become 16
2026-09-13 14:49:11 +07:00
generic-runaway.flan
The prelude's per-type families collapse: 22 functions become 10, 27 become 16
2026-09-13 14:49:11 +07:00
generics.flan
The map operations are deferred, and the clause is what pays for it
2026-09-13 15:23:37 +07:00
handles.flan
Say what the spec now disagrees with, and that item 6 is closed
2026-09-13 08:07:44 +07:00
higher-order.flan
The prelude's per-type families collapse: 22 functions become 10, 27 become 16
2026-09-13 14:49:11 +07:00
into.flan
The two cases the tests did not cover, and one leak of a permission
2026-09-13 09:32:58 +07:00
loops.flan
Pin the latch to the continue path, and the clause barrier to its reason
2026-09-12 22:00:13 +07:00
machine.flan
Every defn in the tree states its return type, and Unit is written ()
2026-09-12 23:06:40 +07:00
macro-cycle.flan
unless is not a special form any more
2026-09-12 20:59:12 +07:00
macro-spin.flan
unless is not a special form any more
2026-09-12 20:59:12 +07:00
macro-unless.flan
The return type stops being a guess: the slot is mandatory, unit is ()
2026-09-12 23:18:28 +07:00
macros.flan
unless is not a special form any more
2026-09-12 20:59:12 +07:00
map-exhausted.flan
The return type stops being a guess: the slot is mandatory, unit is ()
2026-09-12 23:18:28 +07:00
map-iter.flan
Every defn in the tree states its return type, and Unit is written ()
2026-09-12 23:06:40 +07:00
map-stale-region.flan
The Map's tests join the suite, and the epoch trap covers its half
2026-09-12 16:09:27 +07:00
maps.flan
Cover a dev build and a map that leaves its let
2026-09-12 16:34:25 +07:00
math2.flan
Every defn in the tree states its return type, and Unit is written ()
2026-09-12 23:06:40 +07:00
math.flan
Every defn in the tree states its return type, and Unit is written ()
2026-09-12 23:06:40 +07:00
nth-gone.flan
Remove nth, the alias that was not one
2026-09-12 04:46:41 +07:00
pkg-alias-clash.flan
A ring of imports is refused by name, not swallowed
2026-09-12 16:46:30 +07:00
pkg-cycle.flan
A ring of imports is refused by name, not swallowed
2026-09-12 16:46:30 +07:00
pkg-diamond.flan
A ring of imports is refused by name, not swallowed
2026-09-12 16:46:30 +07:00
pkg-hidden-main.flan
sand is one program again
2026-09-11 20:11:01 +07:00
pkg-macro-bare.flan
Macros come from a package now, and the refusal's reason was wrong
2026-09-13 15:40:08 +07:00
pkg-macro-idle.flan
C-x C-e expands, and a declaration is not an expression
2026-09-13 17:54:36 +07:00
pkg-macro-ring.flan
Macros come from a package now, and the refusal's reason was wrong
2026-09-13 15:40:08 +07:00
pkg-macro-spin.flan
Macros come from a package now, and the refusal's reason was wrong
2026-09-13 15:40:08 +07:00
pkg-macro.flan
Macros come from a package now, and the refusal's reason was wrong
2026-09-13 15:40:08 +07:00
pkg-return.flan
Sweep every field label from the colon spelling to the dot
2026-09-12 14:47:54 +07:00
pkg-shadow.flan
A local shadowing an imported name, in an expression and in a place
2026-09-12 10:40:47 +07:00
pkg-shared.flan
Retire the per-type printers, since print says all of it
2026-09-12 05:32:25 +07:00
pkg-two-aliases.flan
sand is one program again
2026-09-11 20:11:01 +07:00
pkg-two-mains.flan
sand is one program again
2026-09-11 20:11:01 +07:00
pkg-unused.flan
Retire the per-type printers, since print says all of it
2026-09-12 05:32:25 +07:00
pool-stale-region.flan
Six refusals and a trap, each one a way of losing the property
2026-09-13 07:59:04 +07:00
printers.flan
A promise the compiler cannot check gets its own refusal, and a session expands its buffer's macros
2026-09-13 20:33:47 +07:00
println.flan
The return type stops being a guess: the slot is mandatory, unit is ()
2026-09-12 23:18:28 +07:00
raylib-audio.flan
Every defn in the tree states its return type, and Unit is written ()
2026-09-12 23:06:40 +07:00
raylib-ffi.flan
The renderer was one binding away, and the import was not allowed to be the answer
2026-09-13 07:50:03 +07:00
raylib-font.flan
Every defn in the tree states its return type, and Unit is written ()
2026-09-12 23:06:40 +07:00
raylib-image.flan
The renderer was one binding away, and the import was not allowed to be the answer
2026-09-13 07:50:03 +07:00
raylib-imported.flan
A table for the importer, against a header that does not move
2026-09-12 16:09:48 +07:00
reach-walk.flan
The prelude's per-type families collapse: 22 functions become 10, 27 become 16
2026-09-13 14:49:11 +07:00
recur.flan
The two cases the tests did not cover, and one leak of a permission
2026-09-13 09:32:58 +07:00
registry.flan
Following a pointer was never a type question; it was a permission question
2026-09-13 09:17:47 +07:00
reload-generic.flan
C-c C-c on a generic installs its copies, and a refusal about one says where it came from
2026-09-13 14:37:55 +07:00
reload-v2.flan
Retire the per-type printers, since print says all of it
2026-09-12 05:32:25 +07:00
reload-v3.flan
Retire the per-type printers, since print says all of it
2026-09-12 05:32:25 +07:00
reload-v4.flan
Retire the per-type printers, since print says all of it
2026-09-12 05:32:25 +07:00
reload-v5.flan
Retyping a global across a reload, which nothing had ever done
2026-09-12 10:51:14 +07:00
reload.flan
Retire the per-type printers, since print says all of it
2026-09-12 05:32:25 +07:00
restarts.flan
Sweep every field label from the colon spelling to the dot
2026-09-12 14:47:54 +07:00
rl-with-reject.flan
A begin/end pair that cannot come apart, and what it still cannot promise
2026-09-13 18:00:35 +07:00
rl-with.flan
A begin/end pair that cannot come apart, and what it still cannot promise
2026-09-13 18:00:35 +07:00
sand-headless.flan
Retire the per-type printers, since print says all of it
2026-09-12 05:32:25 +07:00
shadow-pkg.flan
A local shadowing an imported name, in an expression and in a place
2026-09-12 10:40:47 +07:00
signedness.flan
Retire the per-type printers, since print says all of it
2026-09-12 05:32:25 +07:00
slice-from-ptr.flan
A pointer from C can state its length, and then it is a slice
2026-09-13 17:40:59 +07:00
slices.flan
The prelude's per-type families collapse: 22 functions become 10, 27 become 16
2026-09-13 14:49:11 +07:00
slurp-unhandled.flan
slurp reads a whole file, barf writes one, and failure is a condition
2026-09-12 11:38:24 +07:00
slurp.flan
slurp reads a whole file, barf writes one, and failure is a condition
2026-09-12 11:38:24 +07:00
stale-region.flan
(Vec T) over a type-erased runtime, with StorageExhausted going in beside it
2026-09-12 11:07:57 +07:00
string-of-bytes.flan
Every defn in the tree states its return type, and Unit is written ()
2026-09-12 23:06:40 +07:00
strings.flan
Every defn in the tree states its return type, and Unit is written ()
2026-09-12 23:06:40 +07:00
text.flan
The prelude's per-type families collapse: 22 functions become 10, 27 become 16
2026-09-13 14:49:11 +07:00
unions.flan
A union is a type name, and (vec-new) did not think so
2026-09-12 20:27:19 +07:00
unit-main.flan
The return type stops being a guess: the slot is mandatory, unit is ()
2026-09-12 23:18:28 +07:00
user-allocator.flan
Say what the two one-line refusal programs are refusing, and why
2026-09-12 11:15:58 +07:00
utf8.flan
Every defn in the tree states its return type, and Unit is written ()
2026-09-12 23:06:40 +07:00
values.flan
Sweep every field label from the colon spelling to the dot
2026-09-12 14:47:54 +07:00
vec-double-free.flan
(Vec T) over a type-erased runtime, with StorageExhausted going in beside it
2026-09-12 11:07:57 +07:00
vec-global.flan
Ownership is not transitive yet, so refuse the three shapes that assume it is
2026-09-12 11:12:49 +07:00
vec-in-struct.flan
Ownership is not transitive yet, so refuse the three shapes that assume it is
2026-09-12 11:12:49 +07:00
vec-moved-in-loop.flan
(Vec T) over a type-erased runtime, with StorageExhausted going in beside it
2026-09-12 11:07:57 +07:00
vec-moved.flan
(Vec T) over a type-erased runtime, with StorageExhausted going in beside it
2026-09-12 11:07:57 +07:00
vec-of-vec.flan
Ownership is not transitive yet, so refuse the three shapes that assume it is
2026-09-12 11:12:49 +07:00
vec-to-c.flan
Ownership is not transitive yet, so refuse the three shapes that assume it is
2026-09-12 11:12:49 +07:00
vec-untyped.flan
(Vec T) over a type-erased runtime, with StorageExhausted going in beside it
2026-09-12 11:07:57 +07:00
vec.flan
Sweep every field label from the colon spelling to the dot
2026-09-12 14:47:54 +07:00
virtual-controls-headless.flan
Sweep every field label from the colon spelling to the dot
2026-09-12 14:47:54 +07:00
web-files.flan
One source, two outcomes: barf is refused on the web and says so
2026-09-12 11:41:24 +07:00