externum Files

Language upgrades

• |> pipeline operator: x |> f(a, b) = f(x, a, b) — in the Python target and on the VM. Chains: x |> f |> g.
• fn keyword: fn name(args) -> T: as an alias for def.
• Real bash target: --target bash now translates module-level Externum logic (arithmetic, while, for/range, if/elif/else, print, embedded bash blocks) into a standalone set -euo pipefail script. Unsupported statements emit warnings — never silent empty output again.

VM fixes

• #21 — module-level += stored into a frame nothing read → silent infinite loops. Fixed; the VM now runs benchmarks/bench.ext correctly (verified against CPython).
• #22 — parenthesized RHS raised undefined global. Fixed.
• Lexer was missing %= (tokenized as % =); aug-assign ops other than += silently degraded to addition; obj.attr += / x[i] += / *p += emitted no store. All fixed.
• Closes [#19], [#20], [#21], [#22].

376 tests. PyPI: pip install externum==4.2.0