for loops

compiler/hir/hir.odin

@@ -111,6 +111,7 @@ Expr_Kind :: enum u8 {
 	Ge,
 	And,
 	Or,
+	Range,
 	Call,
 }
 
@@ -142,18 +143,25 @@ Stmt_Kind :: enum u8 {
 	Trap,
 	If,
 	While,
+	For,
 }
 
 Stmt :: struct {
 	kind:       Stmt_Kind,
 	span:       source.Span,
 	local:      Local_Id,
+	index_local: Local_Id,
 	target:     Expr_Id,
 	expr:       Expr_Id,
+	iterator_type: types.Type,
+	pointer_capture: bool,
 	// `If` statements use `expr` as the condition and `then_body`/`else_body` as
 	// the branch statement lists.
 	// `While` statements use `expr` as the condition, `then_body` as the loop
 	// body, and `update` as the optional post-iteration statement.
+	// `For` statements use `expr` as the iterable, `local` as the item capture,
+	// `index_local` as the optional sequence index, and `iterator_type` as the
+	// normalized many-item pointer type for sequence iteration.
 	then_body:  []Stmt_Id,
 	else_body:  []Stmt_Id,
 	update:     Stmt_Id,