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fix(arith): assign to array elements in ((...)), let and $((...)) - #2558
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((a[i]++)), ((c[$k]+=n)), ((a[2]=5)), let a[1]++ now update the element instead of losing the write. Indexed subscripts are arithmetic (negative allowed); associative keys are literal with $name expanded and quotes dropped. Writes stay on the budgeted array writers. Claude-Session: https://claude.ai/code/session_019aFikmptPc91Fj4N2iDXQA
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Requested by Михайло · project thread
What changed
Arithmetic can assign to array elements:
((a[i]++)),((c[$k]+=3)),((a[2]=5)),((--a[0])),let a[1]++,$((c[x]--)). Indexed subscripts are evaluated arithmetically (negative indexes count from the end). Associative keys are literal, with$name/${name}expanded and quotes dropped (c["x y"],c[k$i]).Why
Counting with
((count[$word]++))is a very common agent idiom. Gap telemetry showed it silently produced empty or stale values.Before
After
arith-array-lvalue.test.sh(14 cases) matches real bash 5.2 on every case.Risk
Low. Writes go through the same budgeted array writers as
${a[i]:=v}; new testtm_dos_060_arithmetic_array_writes_respect_budgetchecksmax_array_entriesstill caps them.((...))now drops lexer quote markers from words (bash removes quotes there too).Checklist
cargo test -p bashkit --lib --tests, clippy, fmthttps://claude.ai/code/session_019aFikmptPc91Fj4N2iDXQA
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