fixes

tests/expected/50-smoke.txt

@@ -139,6 +139,7 @@ ptr!=null: false
 ptr2==null: false
 ptr2!=null: true
 ptr-nested-field: 1.000000 2.000000 3.000000
+mp-store-sentinel: 42
 vec-construct: [1.000000, 3.000000, 2.000000]
 vec-add: [5.000000, 7.000000, 9.000000]
 vec-sub: [4.000000, 3.000000, 2.000000]
@@ -609,6 +610,7 @@ usize->s64: 42
 not wasm
 known os
 desktop 64-bit
+pointer size via if: 8
 === Trailing Commas ===
 trailing commas ok
 === DONE ===