Fall back to SQL formatting for non-PL/pgSQL bodies

[gmr]

Summary

format_plpgsql errored on LANGUAGE sql function bodies — a bare SQL statement such as WITH … SELECT … — because they aren't PL/pgSQL blocks. pglifecycle hit this on check_for_invalid_domains.

When the PL/pgSQL parse has errors, try format() (SQL) and return that if it parses cleanly; otherwise report the original PL/pgSQL syntax error. This lets callers that route all function bodies through format_plpgsql handle SQL-language functions, and only changes behavior in the previously-erroring case.

Verification

• New sql_body_fallback regression test; full suite + clippy green.
• With the companion escape-string grammar fix (Add escape string literal (E'...') token tree-sitter-postgres#44), the real check_for_invalid_domains body (a WITH … SELECT using E'…' strings) now formats via this fallback.

🤖 Generated with Claude Code

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Configuration used: Organization UI

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Run ID: 3dd70b4b-5a26-479b-a495-4e671741558f

📥 Commits

Reviewing files that changed from the base of the PR and between 30a0b34 and 57c38b4.

📒 Files selected for processing (2)

• src/lib.rs
• tests/plpgsql_test.rs

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