1(module $m
2  (memory (export "mem") 1)
3
4  (func (export "load") (param i32) (result i32)
5    local.get 0
6    i32.load8_u))
7
8(register "m" $m)
9
10(assert_trap
11  (module
12    (memory (import "m" "mem") 1)
13
14    ;; This is in bounds, and should get written to the memory.
15    (data (i32.const 0) "abc")
16
17    ;; Partially out of bounds. None of these bytes should get written, and
18    ;; instantiation should trap.
19    (data (i32.const 65530) "zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz")
20  )
21  "out of bounds"
22)
23
24;; The first data segment got written.
25(assert_return (invoke $m "load" (i32.const 0)) (i32.const 97))
26(assert_return (invoke $m "load" (i32.const 1)) (i32.const 98))
27(assert_return (invoke $m "load" (i32.const 2)) (i32.const 99))
28
29;; The second did not get partially written.
30(assert_return (invoke $m "load" (i32.const 65530)) (i32.const 0))
31(assert_return (invoke $m "load" (i32.const 65531)) (i32.const 0))
32(assert_return (invoke $m "load" (i32.const 65532)) (i32.const 0))
33(assert_return (invoke $m "load" (i32.const 65533)) (i32.const 0))
34(assert_return (invoke $m "load" (i32.const 65534)) (i32.const 0))
35(assert_return (invoke $m "load" (i32.const 65535)) (i32.const 0))
36