Brummel
13946219f5
`runtime/str.c::ailang_float_to_str` now applies the `.0`-fallback
already enforced by the surface printer's `write_float_lit`
(crates/ailang-surface/src/print.rs lines 624-637): after the
existing `%g` snprintf, if `x` is finite and the rendered buffer
contains neither `.` nor `e`/`E`, append `.0` so a whole-valued
Float renders with Float-shaped text. The `isfinite(x)` fence
keeps `nan`/`inf`/`-inf` from matching the predicate and turning
into `nan.0`/`inf.0`. The 64-byte stack buffer's truncation guard
is extended by 2 bytes for the fallback path so the defensive
`abort()` discipline holds.
The alternative (document `%g`-without-fallback in the design/
ledger as a deliberate human-friendly contract) was rejected: the
language's stated ethos is machine-readability and round-trip
identity; the surface printer is the reference, runtime drift
from it is a defect not a feature.
Golden updates flow from the contract change. Three fixtures
encoded the old Int-shaped output for Float values:
- `crates/ail/tests/floats_e2e.rs`: `"4\n42\n-1.5\n"` →
`"4.0\n42.0\n-1.5\n"` (1.5+2.5=4.0, int_to_float(42)=42.0).
- `crates/ail/tests/e2e.rs::mut_sum_floats_prints_55`: `"55"` →
`"55.0"`. The accompanying doc comment used to canonicalise the
bug ("`%g` strips the trailing `.0` — so the canonical stdout
for Float 55.0 is `55`"); rewritten to reflect the new contract.
- `examples/mut_sum_floats.ail` docstring: same correction.
Two doc comments are updated where the post-fix contract differs
from the old text but the fixture golden does not change:
- `examples/float_to_str_smoke.ail` docstring (3.5 still renders
as `3.5` because `.` is already present — the fallback does not
fire).
- `crates/ail/tests/e2e.rs::float_to_str_smoke` doc comment (same
observation, made explicit so the trip-wire's intent is clear).
Verified: `cargo test -p ail --test print_float_whole_e2e` green
(was RED at f19b0dd); `cargo test --workspace` 0 failed across
all crates and integration suites.
closes #7
18 lines
685 B
Plaintext
18 lines
685 B
Plaintext
(module mut_sum_floats
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(fn main
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(doc "Float twin of mut_counter via a tail-recursive helper. Expected stdout: 55.0 (Float 55.0 via %g plus the runtime `.0`-fallback for finite whole-valued doubles, Gitea #7).")
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(type (fn-type (params) (ret (con Unit)) (effects IO)))
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(params)
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(body
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(app print (app sum_helper 1.0 10.0 0.0))))
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(fn sum_helper
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(doc "Accumulator-style tail-recursive Float helper — sum from lo through hi inclusive.")
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(type (fn-type (params (con Float) (con Float) (con Float)) (ret (con Float))))
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(params lo hi acc)
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(body
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(if (app > lo hi)
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acc
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(tail-app sum_helper (app + lo 1.0) hi (app + acc lo))))))
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