for loops

compiler/ast/ast.odin

@@ -92,6 +92,7 @@ Expr_Kind :: enum u8 {
 	Ge,
 	And,
 	Or,
+	Range,
 	Call,
 }
 
@@ -104,6 +105,7 @@ Expr :: struct {
 	left:       Expr_Id,
 	right:      Expr_Id,
 	diagnostic: source.Diagnostic_Id,
+	parenthesized: bool,
 	kind:       Expr_Kind,
 }
 
@@ -121,14 +123,17 @@ Stmt_Kind :: enum u8 {
 	Expression,
 	If,
 	While,
+	For,
 }
 
 Stmt :: struct {
 	kind:       Stmt_Kind,
 	span:       source.Span,
 	name:       symbol.Id,
+	index_name: symbol.Id,
 	type:       Type_Syntax,
 	immutable:  bool,
+	pointer_capture: bool,
 	target:     Expr_Id,
 	expr:       Expr_Id,
 	// `If` statements use `expr` as the condition, `body` as the then-block, and
@@ -136,6 +141,9 @@ Stmt :: struct {
 	// `else_body` holding a single nested `If` statement.
 	// `While` statements use `expr` as the condition, `body` as the loop body,
 	// and `update` as the optional post-iteration statement.
+	// `For` statements use `expr` as the iterable, `name` as the item capture,
+	// `index_name` as the optional index capture, and `pointer_capture` to
+	// distinguish `|@item|` from copy capture.
 	body:       []Stmt_Id,
 	else_body:  []Stmt_Id,
 	update:     Stmt_Id,