match statements

compiler/ast/ast.odin

@@ -134,6 +134,8 @@ Stmt_Kind :: enum u8 {
 	Block,
 	Defer,
 	Yield,
+	Match,
+	Match_Arm,
 }
 
 Assignment_Op :: enum u8 {
@@ -175,6 +177,10 @@ Stmt :: struct {
 	// `Block` statements (a bare `{ ... }` scope) use `body` as their statements.
 	// `Defer` statements use `update` as the deferred statement (which may itself
 	// be a `Block`).
+	// `Match` statements use `expr` as the subject and `body` as the list of arm
+	// statements (each a `Match_Arm`). A `Match_Arm` uses `expr` as its pattern
+	// (`INVALID_EXPR` marks the `else` arm), `captures` for the optional payload
+	// capture (0 or 1 name, tagged-union variants only), and `body` as the arm body.
 	captures:   []symbol.Id,
 	guard:      Expr_Id,
 	body:       []Stmt_Id,