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Ran 04 Dec 2025 03:24AM UTC

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Committed 04 Dec 2025 03:02AM UTC coverage: 49.252% (-0.07%) from 49.323%

Job # 19916207611.1

Build Type

push

github

Committed by

web-flow

Commit Message

don't crash in log procedure (#575)

* stop steel from crashing in log procedure

before:

```
λ > (log 0 10)

thread 'main' (911264) panicked at crates/steel-core/src/primitives/numbers.rs:2014:78:
argument of integer logarithm must be positive
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```

after:

```
λ > (log 0 10)
error[E11]: Generic
  ┌─ :1:2
  │
1 │ (log 0 10)
  │  ^^^ log: division by zero (log 0 10)
```

* make (log) always return an inexact number

this is for two reasons:

1. the r7rs spec defines log as an "inexact library procedure" and all
implementations i tested always return a float

2. with this change `(= (log x y) (/ (log x) (log y))` also holds true
when x and y are both integers.

* fix log tests

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