Module checker 

M3: type checker. Walks the canonical AST, infers types via unification, and checks declared signatures and effects.

Structs

ProgramTypes

Result of checking a whole program.

Functions

check_and_rewrite_program

Type-check stages and rewrite every module.parse(s) call where the inferred T is a Record into the equivalent module.parse_strict(s, [field_names]) (#168). Existing check_program keeps the old immutable signature for tests and tools that don’t want the AST rewritten.

check_program

check_program_with_positions

Variant of check_program that stamps a source Position onto every emitted error (#306 slice 1).