Fix try_array_type

hercules_ir/src/ir.rs

@@ -743,15 +743,15 @@ impl Constant {
     }
 
     pub fn try_array_type(&self, types: &[Type]) -> Option<TypeID> {
-        // Need types, since zero initializer may be for a collection type, ro
+        // Need types, since zero initializer may be for a collection type, or
         // not.
         match self {
             Constant::Array(ty, _) => Some(*ty),
             Constant::Zero(ty) => {
-                if types[ty.idx()].is_primitive() {
-                    None
-                } else {
+                if types[ty.idx()].is_array() {
                     Some(*ty)
+                } else {
+                    None
                 }
             }
             _ => None,