mojo-type-safety

Testing & Quality

Validate type safety in Mojo code including parametric types and trait constraints. Use during code review or when type errors occur.

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Type Safety Validation Skill

Ensure Mojo code follows type safety principles.

When to Use

Type errors during compilation
Code review for type safety
Designing generic functions
Working with trait constraints

Quick Reference

# Generic function with type parameter
fn add[dtype: DType](a: Scalar[dtype], b: Scalar[dtype]) -> Scalar[dtype]:
    return a + b

# Trait constraint
fn process[T: Copyable](data: T):
    let copy = data  # T is Copyable

# Compile-time check
@parameter
fn validate[size: Int]():
    constrained[size > 0, "Size must be positive"]()

Workflow

Add type annotations - All parameters and returns
Use type parameters - For generic code
Add trait constraints - When required
Run compiler - Verify type checking passes
Test generic code - With multiple types

Mojo-Specific Notes

Prefer fn over def for type safety
Generic type parameters use [T] syntax
Traits constrain what operations are allowed
Compile-time checks prevent runtime errors

Error Handling

Error	Cause	Solution
`Missing type annotation`	Untyped parameter	Add `: Type` to parameter
`Type mismatch`	Incompatible types	Add explicit conversion
`Unsupported operation`	Trait not constrained	Add trait constraint
`Constraint failed`	Compile-time check failed	Verify constraint conditions

References

.claude/shared/mojo-guidelines.md - Current syntax and patterns
.claude/shared/mojo-anti-patterns.md - Common constructor mistakes