seed Grammar

The normative operational grammar is maintained in seed/compiler/llvm/LANGUAGE_GRAMMAR.md. This book page intentionally avoids a second grammar copy that can drift.

The root normative language specification is seed Language Specification.

Current lexical contract:

• .sd files are UTF-8;
• comments and strings may contain Unicode;
• value names use ASCII lower snake case; nominal types and variants use ASCII UpperCamelCase;
• constants are ASCII upper snake case;
• comments use // and nestable /* ... */;
• early return uses return;
• ADTs use enum;
• phase-1/2 f-string interpolation is implemented for text, bool, integers, floats, format specifications, and static display/debug traits;
• built-in channel/send/recv syntax is not implemented; those facilities are provided by the ordinary task library.

See Language Reference for the user syntax and CLI summary.