| Index: src/types.h | 
| diff --git a/src/types.h b/src/types.h | 
| index 8490cbb2ed1ecb74493d8f9d20cc8bc9f7443af9..1d506d0ca2eba3a2fa898ebde2530f20d5e421ee 100644 | 
| --- a/src/types.h | 
| +++ b/src/types.h | 
| @@ -787,6 +787,7 @@ class TypeImpl<Config>::RangeType : public StructuralType { | 
|  | 
| static RangeHandle New( | 
| i::Handle<i::Object> min, i::Handle<i::Object> max, Region* region) { | 
| +    DCHECK(IsInteger(min->Number()) && IsInteger(max->Number())); | 
| DCHECK(min->Number() <= max->Number()); | 
| RangeHandle type = Config::template cast<RangeType>( | 
| StructuralType::New(StructuralType::kRangeTag, 3, region)); | 
|  |