Module ast 

Abstract Syntax Tree for Seq

Minimal AST sufficient for hello-world and basic programs. Will be extended as we add more language features.

Structs

MatchArm

A single arm in a match expression

Program

QuotationSpan

Source span for a quotation, supporting multi-line ranges

SourceLocation

Source location for error reporting and tooling

Span

Source span for a single token or expression

UnionDef

A union type definition Example:

UnionField

A field in a union variant Example: response-chan: Int

UnionVariant

A variant in a union type Example: Get { response-chan: Int }

WordDef

Enums

Include

Include statement

Pattern

A pattern in a match expression For Phase 1: just the variant name (stack-based matching) Later phases will add field bindings: Get { chan }

Statement