Add type-checking fuzzer that generates valid Roc code #8829
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This adds a new fuzzer that generates syntactically and semantically valid Roc code, then verifies the parse-canonicalize-type-check pipeline accepts it without crashes or type errors. The TypedCodeGenerator maintains scopes with variable-to-type mappings and generates type-correct expressions including: - Literals for Bool, Str, List, and all numeric types - Let bindings with proper type annotations - If-then-else expressions - Block expressions with nested scopes This complements the existing canonicalization fuzzer which tests robustness against arbitrary input - this fuzzer tests correctness by generating code that should always type-check successfully. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Summary
fuzz-typecheck) that generates syntactically and semantically valid Roc codeThe
TypedCodeGeneratormaintains scopes with variable-to-type mappings and generates type-correct expressions including:Test plan
zig build repro-typecheck./zig-out/bin/repro-typecheck --verbose <seed_file>🤖 Generated with Claude Code