[stdlib] Fix Int.__floordiv__ and friends

Signed-off-by: Yiwu Chen <[email protected]>

stdlib/src/builtin/int.mojo

@@ -596,8 +596,8 @@ struct Int(
         var div: Int = self._positive_div(denominator)
 
         var mod = self - div * rhs
-        var divMod = select(((rhs < 0) ^ (self < 0)) & mod, div - 1, div)
-        div = select(self > 0 & rhs > 0, div, divMod)
+        var div_mod = select(((rhs < 0) ^ (self < 0)) & mod, div - 1, div)
+        div = select((self > 0) & (rhs > 0), div, div_mod)
         div = select(rhs == 0, 0, div)
         return div
 
@@ -615,9 +615,9 @@ struct Int(
         var div: Int = self._positive_div(denominator)
 
         var mod = self - div * rhs
-        var divMod = select(((rhs < 0) ^ (self < 0)) & mod, mod + rhs, mod)
+        var div_mod = select(((rhs < 0) ^ (self < 0)) & mod, mod + rhs, mod)
         mod = select(
-            self > 0 & rhs > 0, self._positive_rem(denominator), divMod
+            (self > 0) & (rhs > 0), self._positive_rem(denominator), div_mod
         )
         mod = select(rhs == 0, 0, mod)
         return mod
@@ -635,7 +635,7 @@ struct Int(
         if rhs == 0:
             return 0, 0
         var div: Int = self._positive_div(rhs)
-        if rhs > 0 & self > 0:
+        if (rhs > 0) & (self > 0):
             return div, self._positive_rem(rhs)
         var mod = self - div * rhs
         if ((rhs < 0) ^ (self < 0)) & mod: