The Letlang Abstract Syntax Tree MUST be translated to Rust code.

Generated code MUST include source-mapping comments:

//source-map:begin=NodeType file="example/foo.let" line=8 column=4

Once the AST has been validated by a semantic walk, the generated code SHOULD be valid and not produce compilation errors.

If for some reason, the previous requirement cannot be satisfied, the source mapping information MUST be used to pin-point the error back to the Letlang source file.