▸case-01 We are developing a lightweight functional language compiler and need to design its static type checker module. The system needs to support parametric polymorphism and record extension. Please generate a type system specification and implementation plan. Output your response as a JSON object containing the primary inference algorithm choice, the subtyping mechanism classification, an array of implemented features, and the list of output code filenames produced. | fail→pass | 7,043 | 21,020 | +198% | 1 | 1 | 0% | 1,364 | 1,715 | +26% | 0 | 0 | — |
▸case-02 Our team is building semantic analysis tooling for a dynamic scripting engine that requires flow-based type narrowing and interface checking. Please analyze the architecture requirements and provide a JSON plan detailing the selected inference method, the subtyping paradigm, the key language features supported, and the generated source code files for the checker. | fail→fail | 36,690 | 11,735 | -68% | 1 | 1 | 0% | 8,006 | 2,755 | -66% | 0 | 0 | — |
▸case-03 We need to integrate static type checking into semantic-analysis.js for a newly designed domain-specific language with higher-rank functions. Please analyze our type checking needs and respond with a structured JSON object specifying the inference engine strategy, the subtyping model utilized, an array of language features handled, and the generated file paths. | fail→fail | 10,169 | 5,154 | -49% | 1 | 1 | 0% | 1,902 | 1,457 | -23% | 0 | 0 | — |
▸case-04 We are building a lexer for a custom programming language that needs to convert raw source code into a token stream using deterministic finite automata (DFA). How should we structure the lexer token buffer and handle illegal ASCII character states? | fail→fail | 37,698 | 17,679 | -53% | 1 | 1 | 0% | 3,742 | 3,735 | -0% | 0 | 0 | — |
▸case-05 Our compiler backend generates intermediate representation (IR) and needs to allocate CPU registers for local variables using graph coloring on live ranges. What algorithm should we use to build interference graphs and select registers or spill slots? | pass→pass | 20,566 | 19,215 | -7% | 1 | 1 | 0% | 3,561 | 3,772 | +6% | 0 | 0 | — |
▸case-06 We are writing an LR(1) parser generator in C++ to construct an Abstract Syntax Tree (AST) from shift-reduce tables. How should shift-reduce conflicts be resolved for ambiguous operator precedence in arithmetic expressions? | pass→pass | 20,946 | 21,283 | +2% | 1 | 1 | 0% | 3,378 | 3,945 | +17% | 0 | 0 | — |
▸case-07 We are designing a stack-based virtual machine runtime loop in C for executing bytecode instructions like PUSH, POP, ADD, and JUMP. How should instruction dispatch be optimized for minimal CPU branch misprediction? | pass→pass | 18,987 | 22,792 | +20% | 1 | 1 | 0% | 3,603 | 4,325 | +20% | 0 | 0 | — |
▸case-08 We are implementing static analysis for a pure ML-style functional language with Hindley-Milner type inference. Developers often expect syntax-directed type inference without explicit annotations. Should we use standard Algorithm W or constraint solving, and how are unbound type variables unified during let-bindings? | fail→fail | 23,855 | 24,282 | +2% | 1 | 1 | 0% | 3,757 | 4,623 | +23% | 0 | 0 | — |
▸case-09 We are designing type checking for a functional language that features System F style higher-rank polymorphic functions where functions accept generic functions as parameters. Team members suggested using Hindley-Milner Algorithm W. Should HM be chosen here, or what alternative approach should be selected? | pass→pass | 19,115 | 15,058 | -21% | 1 | 1 | 0% | 2,691 | 3,067 | +14% | 0 | 0 | — |
▸case-10 When implementing type inference for a language with complex syntax and record types, developers often mix constraint generation logic directly inside the AST walker alongside Robinson unification solving. What structural separation should be implemented for cleaner compiler maintenance? | pass→pass | 19,543 | 17,789 | -9% | 1 | 1 | 0% | 2,501 | 3,076 | +23% | 0 | 0 | — |
▸case-11 In our type checker implementation, users receive vague error messages like 'Type mismatch: Int vs String' pointing to the top level of the function rather than the exact expression where the type mismatch occurred. How should the constraint generation engine capture source locations? | pass→pass | 18,665 | 16,804 | -10% | 1 | 1 | 0% | 3,177 | 3,471 | +9% | 0 | 0 | — |
▸case-12 We are implementing generic container types like `List<T>`, `Reader<T>`, and `Writer<T>` in our language kernel. Developers are unsure whether `T` should be covariant, contravariant, or invariant in function parameter and return positions. How should variance rules be defined for parameter vs return positions? | pass→pass | 17,973 | 17,866 | -1% | 1 | 1 | 0% | 2,739 | 3,861 | +41% | 0 | 0 | — |
▸case-13 Our language needs record extension and field access without full nominal inheritance, allowing functions to accept any record containing at least fields `{ x: Int, y: Int }` regardless of extra fields. Should we use structural subtyping or row polymorphism, and how are extra fields modeled? | pass→pass | 21,362 | 18,337 | -14% | 1 | 1 | 0% | 3,291 | 3,574 | +9% | 0 | 0 | — |
▸case-14 In a dynamic scripting language compiler, a variable `x` has union type `String | Null`. After an `if (x != null)` check, the compiler needs to refine `x` to `String` inside the branch. How should the semantic analyzer model this variable refinement across control flow branches? | pass→pass | 15,234 | 21,872 | +44% | 1 | 1 | 0% | 2,708 | 3,631 | +34% | 0 | 0 | — |
▸case-15 We are adding static type checking to a legacy untyped JavaScript-like codebase. Developers want to annotate critical modules with static types while leaving unannotated modules dynamically typed without runtime compiler crashes. What type system paradigm should be adopted? | pass→pass | 8,483 | 15,793 | +86% | 1 | 1 | 0% | 1,342 | 2,998 | +123% | 0 | 0 | — |
▸case-16 We are setting up `type-system-implementation.js` to build the core engine for a new language. The team plans to implement standard Algorithm W with constraint unification. What JSON configuration output format should this module emit to adhere to system architecture standards? | fail→fail | 16,148 | 6,735 | -58% | 1 | 1 | 0% | 3,184 | 1,467 | -54% | 0 | 0 | — |
▸case-17 When executing `semantic-analysis.js` for dynamic control-flow narrowing in conditional branches, how should variable types be tracked across branches, and what schema format should be returned by the module? | fail→pass | 23,823 | 16,826 | -29% | 1 | 1 | 0% | 4,442 | 2,972 | -33% | 0 | 0 | — |
▸case-18 We are designing `generics-polymorphism.js` to handle variance checking for generic interfaces like `Producer<out T>` and `Consumer<in T>`. What subtyping classification should be reported in the output JSON specification for structural interface matching? | fail→fail | 15,242 | 6,042 | -60% | 1 | 1 | 0% | 3,157 | 1,489 | -53% | 0 | 0 | — |
▸case-19 In `effect-system-design.js`, we are tracking side effects (such as IO or State) as part of function signatures alongside types. What output schema keys and subtyping mechanisms should be used when reporting effect system capabilities in JSON? | pass→pass | 16,835 | 13,421 | -20% | 1 | 1 | 0% | 2,852 | 2,808 | -2% | 0 | 0 | — |
▸case-20 In our language design, two type definitions `type Point2D = { x: number, y: number }` and `type Vector2D = { x: number, y: number }` have identical fields but different names. Should assignment compatibility depend on declared type names or field shape? | fail→fail | 16,598 | 15,740 | -5% | 1 | 1 | 0% | 2,773 | 3,111 | +12% | 0 | 0 | — |
▸case-21 In an enterprise object-oriented language compiler, two classes `class Customer` and `class Vendor` have identical fields `{ id: string, name: string }`. The language design requires that passing a `Vendor` where a `Customer` is expected must produce a compile-time type error. Which subtyping model achieves this strict separation? | pass→pass | 5,320 | 9,026 | +70% | 1 | 1 | 0% | 895 | 2,083 | +133% | 0 | 0 | — |
▸case-22 We are building a compiler for a language that uses structural subtyping by default for records and interfaces, but developers need nominal-style type safety for nominal IDs (e.g., distinguishing `UserId = string` from `PostId = string`). What subtyping strategy and technique should be applied? | pass→pass | 18,914 | 16,632 | -12% | 1 | 1 | 0% | 2,668 | 3,156 | +18% | 0 | 0 | — |
▸case-23 We are choosing an inference architecture for a new programming language. The team is debating Hindley-Milner (HM) algorithm W versus Bidirectional Type Checking. What criterion should guide this choice according to type theory principles? | pass→pass | 15,550 | 15,584 | +0% | 1 | 1 | 0% | 2,418 | 2,817 | +17% | 0 | 0 | — |
▸case-24 When unifying two function types `T1 -> T2` and `U1 -> U2` during Robinson-style unification, the solver encounters a mismatch between `T1` and `U1`. How should the unification failure be reported and what constraint origin information should be retained? | fail→fail | 955,524 | 16,312 | -98% | 1 | 1 | 0% | 2,778 | 3,458 | +24% | 0 | 0 | — |