[chaliy]

Requested by Михайло · project thread

What changed

1. Syntax errors no longer discard earlier lines. Like bash, commands on lines before the failing command run first, then the error is reported on stderr with exit 2. exit/set -e before the error still win, the EXIT trap runs, and bash -n keeps whole-script rejection. With nothing runnable before the error, exec() still returns Err(Parse) as before. Applies to top-level exec and child bash/sh.
2. The end of $(...) is found correctly. One shared scanner (parser/subst_scan.rs) for the lexer and parse_word now skips parens inside quotes, escapes, backticks, comments and heredoc bodies. <<< and arithmetic << are not treated as heredocs.

Step 1 of the "closer to real bash" roadmap.

Why

Agents send long multi-line scripts. One typo near the end threw away every earlier command, unlike bash. And common shapes were rejected outright, e.g. a git commit -m "$(cat <<'EOF' ... (scope) ... EOF)" message containing a ), or $(echo ")").

Before / After

$ bashkit -c $'echo first\nif then'
before: Error: parse error ... (nothing ran)
after:  first
        bash: syntax error: parse error at line 2 ...   (exit 2)

$ bashkit -c $'x=$(cat <<\'E\'\nhello )\nE\n); echo "$x"'
before: bash: syntax error: ... unexpected token
after:  hello )

$ bashkit -c 'x=$(echo ")"); echo $x'
before: unterminated double quote
after:  )

The new spec cases pass bash_comparison_tests against real bash locally.

Risk

• Medium
• A script with a late syntax error now partly runs instead of failing up front. This matches bash, and tests that relied on the old behaviour were updated. Known gap, documented in knowledge/foundations/parser.md: a bare case pattern ) inside $(...) still closes early, the same as before.

Checklist

• Tests added or updated (9 integration tests, 9 spec cases, scanner unit tests)
• Backward compatibility considered

https://claude.ai/code/session_019aFikmptPc91Fj4N2iDXQA

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