feat: construct uninitialized compile-time type arrays

source/parser/parse.hon

@@ -299,7 +299,7 @@ parse_statement proc(state @mut State, allow_else bool) ast.NodeId ! ParseError
         .defer, .errdefer: return try parse_cleanup(state, allow_else)
         .open_curly: return try ast.add_block_stmt(state.builder, try parse_block(state))
         .ident, .int, .float, .string, .true, .false, .minus, .bang, .open_paren, .open_bracket, .struct,
-        .enum, .union, .distinct, .alias, .dot, .match, .ampersand, .at, .star, .question, .null, .try, .dollar: {
+        .enum, .union, .distinct, .alias, .dot, .match, .ampersand, .at, .star, .question, .null, .undefined, .try, .dollar: {
             expression :: try parse_expr(state)
             if next_is(state, .equal) return try parse_assignment(state, expression, allow_else)
             return try ast.add_expression_stmt(state.builder, expression)
@@ -852,7 +852,7 @@ member_name proc(kind lexer.TokenKind) bool {
     return match kind {
         .ident, .if, .else, .for, .while, .proc, .return, .break, .continue,
         .true, .false, .and, .or, .mut, .struct, .enum, .union, .distinct,
-        .alias, .match, .import, .test, .c_func, .null, .try, .catch, .defer, .errdefer: true
+        .alias, .match, .import, .test, .c_func, .null, .undefined, .try, .catch, .defer, .errdefer: true
         else: false
     }
 }
@@ -1682,6 +1682,10 @@ parse_primary proc(state @mut State) ast.NodeId ! ParseError {
             state.next_token += 1
             return try ast.add_literal(state.builder, .null, token.span)
         }
+        .undefined: {
+            state.next_token += 1
+            return try ast.add_literal(state.builder, .undefined, token.span)
+        }
         .ident: {
             state.next_token += 1
             return try ast.add_identifier(state.builder, token.span, token.data.str_id)