Fix float.__trunc__ to handle abnormal values

Author: youknowone

tests/snippets/floats.py

@@ -111,7 +111,9 @@
 assert 1.2.__trunc__() == 1
 assert int(1.2) == 1
 assert float(1.2) == 1.2
-# assert math.trunc(1.2) == 1
+assert math.trunc(1.2) == 1
+assert_raises(OverflowError, float('inf').__trunc__)
+assert_raises(ValueError, float('nan').__trunc__)
 
 assert (1.7).real == 1.7
 assert (1.3).is_integer() == False

vm/src/obj/objfloat.rs

@@ -377,8 +377,8 @@ impl PyFloat {
     }
 
     #[pymethod(name = "__trunc__")]
-    fn trunc(&self, _vm: &VirtualMachine) -> BigInt {
-        self.value.to_bigint().unwrap()
+    fn trunc(&self, vm: &VirtualMachine) -> PyResult<BigInt> {
+        try_to_bigint(self.value, vm)
     }
 
     #[pymethod(name = "__round__")]
@@ -413,7 +413,7 @@ impl PyFloat {
     }
 
     #[pymethod(name = "__int__")]
-    fn int(&self, vm: &VirtualMachine) -> BigInt {
+    fn int(&self, vm: &VirtualMachine) -> PyResult<BigInt> {
         self.trunc(vm)
     }