Grammar
v12 adds bracket generics, named construction, payload enums, match modes, try expressions, captures, defer, and extern C.
DByte 12.0 · Reference
Contract§
The tagged language contract is normative.
Mechanics§
The grammar additions cover bracket generic parameters/arguments, named struct initialization, payload enum declarations, explicit match modes, postfix question-mark, borrow expressions, capture lists, defer blocks and extern C declarations.
Validation and failure§
Angle-bracket generic syntax, implicit captures, match guards, named variant payloads and an arrow pointer operator are not v12 grammar.
Evidence and boundary§
Parser tests combine precedence and recovery cases with deterministic diagnostics and current-page stale-syntax scans.