Add get_field method for runtime values - #4464
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Repository UI Review profile: CHILL Plan: Pro Plus Run ID: ⛔ Files ignored due to path filters (1)
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Included review availability: Your plan includes up to 8 reviews per rolling hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe PR adds the public ChangesUnknown field access
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This change adds the method-form access for runtime class fields while preserving existing lookup and diagnostics; no actionable merge-blocking risk remains after normal checks and review. Suggested reviewers: Poem
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In `@baml_language/crates/baml_tests/tests/runtime_classes_and_composites.rs`:
- Around line 517-538: Update declared_get_field_method_shadows_dynamic_fallback
so the receiver is first assigned to an unknown-typed value before invoking
get_field, ensuring the test exercises TyKind::Unknown resolution to
baml.Unknown.get_field; otherwise rename the test to reflect that it only covers
nominal UserClass method resolution.
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baml_language/crates/baml_builtins2/baml_std/baml/core.bamlbaml_language/crates/baml_compiler2_hir_ty/src/method_resolution.rsbaml_language/crates/baml_tests/tests/runtime_classes_and_composites.rs
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Adversarial review — get_field method ergonomicsVerdict: SHIP-WITH-FIXES. The mechanism (a Pre-merge fixes
Recorded, not blocking
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This was referenced Aug 17, 2026
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…L#4469) ## Summary Byte-perfect revert of BoundaryML#4464's \`baml.Unknown\` companion: \`unknown\` returns to having no member surface, and runtime field reads return to the free-function spelling \`reflect.class.get_field<T>(obj, name)\`. Split out of BoundaryML#4466 at Antonio's direction: this revert half merges now; the replacement value-side API (\`reflect.class.instance_from\`) stays on BoundaryML#4466 for explicit human sign-off. ## Verification - \`git diff 15ea8c9 <this branch>\` is **empty** — the tree is byte-identical to pre-BoundaryML#4464 canary (\`15ea8c91c\`), which was CI-green as canary tip. - The single commit is the same revert commit that passed the full pinned five-package gate (3,750 tests) as the base of BoundaryML#4466's branch. ## Notes - BoundaryML#4464's completion/describe/keyword-docs additions and snapshots are all restored to their pre-BoundaryML#4464 state by construction (byte-identical tree). - The E0007 behavioral pin for \`unknown\` member access lands with BoundaryML#4466's replacement surface, not here — this PR is a pure revert. <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit - **Breaking Changes** - Removed the `Unknown` built-in type and its instance-based field access method. - Unknown values no longer provide instance-method completions for dynamic field access. - **Changes** - Runtime class field access now uses the reflective access API. - Updated diagnostics and documentation to reflect the supported field-access behavior. - Removed obsolete completion and regression coverage for the retired API. <!-- end of auto-generated comment: release notes by coderabbit.ai -->
sxlijin
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## Summary - bump all legacy BAML v0 release surfaces from 0.225.0 to 0.226.0 using the repository version-bump configuration - add exactly the two verified external-contributor engine changes: connection pooling from BoundaryML#3975 and OpenAI transcriptions from BoundaryML#4202 - synchronize the new 0.226.0 sections in the top-level and Fern changelogs - regenerate all nine integration clients without test-report churn and update the engine, Rust SDK, and generated Rust integration lockfile versions ## Release boundary - 0.225.0 boundary: release PR BoundaryML#4310 / merge commit da2a673 - BoundaryML#3975 shipped as 521919c - BoundaryML#4202 merged from reviewed head ff96fd4 as squash commit 79b8705; the reviewed-head and squash diffs have the same stable patch ID - BoundaryML#4464 and its byte-perfect revert BoundaryML#4469 have zero net diff and are excluded - rebased onto current canary after BoundaryML#4202 merged ## Validation - TypeScript runtime build and nine-client generation - Python runtime build/install and nine-client generation - deterministic regeneration: unchanged binary diff hash on repeated generation - locked Cargo metadata for the engine and Rust SDK workspaces - generated Rust integration library build: `cargo test --lib --locked` - OpenAI transcription wiremock closure tests: 2 passed - generated Python multipart request test: 1 passed - connection pooling transport test: 1 passed - HTTP config validation fixtures: 8 passed - release metadata and workflow contracts: 50 passed - stale 0.225.0 audit clean across release-owned surfaces; historical junit.xml intentionally unchanged - final release diff matches the 0.225.0 workflow-owned file set, excludes junit.xml test-report churn, and additionally refreshes the two tracked Rust SDK/integration lockfiles proven stale by locked builds ## Status - dependency satisfied; rebased onto current canary with the reviewed BoundaryML#4202 patch present - all required GitHub Actions checks are green; local and GitHub CodeRabbit reviews are green with approval and no review threads or requested changes - merge-ready; awaiting normal human review
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Summary
unknown.get_field<T>(name)as the method-call spelling for typed reads from runtime-shaped class values.reflect.class.get_field<T>(value, name)implementation, preserving lookup, type checking, and thrown diagnostics.Feasibility and scope
The stdlib-only rung is not sufficient because builtin methods are reached through a receiver companion mapping, and
unknownpreviously had no companion. This uses the contained compiler-assist rung: the two existing companion lookup paths map onlyTyKind::Unknowntobaml.Unknown.Declared members win by construction, not by tested candidate ordering: typed class receivers resolve against their own class and never consult the
baml.Unknowncompanion. A typed class withoutget_fieldtherefore remains an E0007 unresolved-member error.baml.Unknownlives afterTaggedStringso adding it does not shift the source lines of existing core items. The remaining snapshot updates record the new companion, its final source location, and the cross-referenced free-function documentation.Validation
Tdiagnostics through both spellings plus the typed-class E0007 containment guard.Summary by CodeRabbit
New Features
get_field<T>access for reading named fields from runtime-shapedunknownvalues.get_fieldonunknownvalues.Bug Fixes
Documentation