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Add rust toolchain toml to fix upstream issue. #61

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Merged
pbower merged 1 commit into from
Apr 19, 2026
Merged

Add rust toolchain toml to fix upstream issue. #61

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15 changes: 15 additions & 0 deletions rust-toolchain.toml
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Original file line number Diff line number Diff line change
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# This is pinned nightly to work around a transitive-dependency break.
#
# `ethnum 1.5.2` (pulled in via polars-arrow when the `cast_polars` feature
# is enabled) constructs `TryFromIntError` via `mem::transmute(())`, which
# assumes the type is zero-sized. The rustc nightly from 2026-04-18 made
# `TryFromIntError` carry a discriminant, so that transmute now hits an
# E0512 size mismatch.
#
# This pin will be removed from Minarrow once either:
# - `ethnum` ships a release (>1.5.2) that constructs the error without
# `mem::transmute`, or
# - `polars-arrow` drops its dependency on the affected `ethnum` version.
[toolchain]
channel = "nightly-2026-04-17"
components = ["rustfmt", "clippy"]
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