[UPDATE PRIMITIVE] Refresh rust PrintAST/PrintCFG .expected to match macro-expanded output

[Copilot]

The Query Unit Tests - rust job was failing because server/ql/rust/tools/test/PrintAST/PrintAST.expected and PrintCFG/PrintCFG.expected did not include the getMacroCallExpansion() subtrees that the rust extractor emits when a Rust toolchain is available (as in CI via install-language-runtimes: true). A previous refresh attempt captured only a partial expansion.

📝 Update Information

Primitive Details

• Type: Tool (test fixtures)
• Name: rust PrintAST / PrintCFG queries
• Update Category: Bug Fix (test fixture refresh)

⚠️ CRITICAL: PR SCOPE VALIDATION

✅ Only .expected test fixtures under server/ql/rust/tools/test/ are touched.

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🛑 MANDATORY PR VALIDATION CHECKLIST

• NO temporary or output files included
• NO unrelated configuration files included
• ALL existing tests continue to pass (5/5 rust query unit tests)

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• Impact Scope: Localized (test fixtures only)

Update Metadata

• Breaking Changes: No
• API Compatibility: Maintained
• Performance Impact: Neutral

🎯 Changes Description

Current Behavior

CI runs the rust query unit tests with the Rust toolchain present, so MacroCall.getMacroCallExpansion() resolves to expanded AST/CFG nodes (e.g. vec!, println!, format_args_nl!). The committed .expected files only contained the unexpanded variant, so PrintAST and PrintCFG failed with FAILED(RESULT).

Updated Behavior

.expected files now contain the fully macro-expanded AST/CFG output produced by the same query + extractor combination CI uses.

Motivation

Unblock CI on the v2.25.3 upgrade branch.

🔄 Before vs. After Comparison

Functionality Changes

No query, schema, or output-format changes. Only .expected fixtures regenerated via:

codeql test run --learn \
  --additional-packs=server/ql/rust/tools \
  -- server/ql/rust/tools/test/PrintAST \
     server/ql/rust/tools/test/PrintCFG

Output Format Changes

Expected fixtures now include getMacroCallExpansion() subtrees, e.g.:

#   24|               getTokenTree(): [TokenTree] TokenTree
+#   24|               getMacroCallExpansion(): [CallExpr] ...::into_vec(...)
+#   24|                 getArgList(): [ArgList] ArgList
...

and CFG edges are corrected from ...::format_args_nl!... placeholders to the expanded FormatArgsExpr / template-string targets.

🧪 Testing & Validation

Test Results

• codeql test run for server/ql/rust/tools/test: 5/5 passed locally with rustc available, matching CI's environment.

📋 Implementation Details

Files Modified

• server/ql/rust/tools/test/PrintAST/PrintAST.expected (+105)
• server/ql/rust/tools/test/PrintCFG/PrintCFG.expected (+34/-4)

Code Changes Summary

• Test fixture refresh to match macro-expanded extractor output

Dependencies

• No New Dependencies

🔍 Quality Improvements

Bug Fixes

• Issue: Query Unit Tests - rust job failed on PrintAST.qlref and PrintCFG.qlref.
• Root Cause: Prior .expected regeneration was performed against an extractor run without macro expansion, so the fixtures lacked getMacroCallExpansion() subtrees that CI consistently produces.
• Solution: Re-ran codeql test run --learn with the Rust toolchain installed locally, capturing the canonical expanded output.
• Prevention: Future .expected regenerations for rust must be performed with rustc/cargo on PATH, equivalent to install-language-runtimes: true in CI.

🚀 Compatibility & Migration

Backward Compatibility

• Fully Compatible

👥 Review Guidelines

Testing Instructions

./server/scripts/run-query-unit-tests.sh --language rust

Requires rustc/cargo on PATH to reproduce CI's macro expansion behavior.

📊 Impact Assessment

Test fixtures only — no runtime, server, or AI-assistant impact.

🔄 Deployment Strategy

• Safe Deployment: fixture-only change

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Update Methodology:

1. ✅ Reproduced CI failure locally
2. ✅ Regenerated fixtures via codeql test run --learn against the same extractor configuration as CI
3. ✅ Verified all 5 rust query unit tests pass