Fix complex __bool__()

stdlib/internal/types/complex.codon

@@ -23,7 +23,7 @@ class complex:
         return self
 
     def __bool__(self) -> bool:
-        return self.real != 0.0 and self.imag != 0.0
+        return self.real != 0.0 or self.imag != 0.0
 
     def __pos__(self) -> complex:
         return self
@@ -313,7 +313,7 @@ class complex64:
         return complex(float(self.real), float(self.imag))
 
     def __bool__(self) -> bool:
-        return self.real != f32(0.0) and self.imag != f32(0.0)
+        return self.real != f32(0.0) or self.imag != f32(0.0)
 
     def __pos__(self) -> complex64:
         return self

test/stdlib/cmath_test.codon

@@ -796,6 +796,21 @@ def test_cmath_testcases():
 test_cmath_testcases()
 
 
+@test
+def test_complex_bool():
+    z = complex(0, 0)
+    assert not bool(z)
+    z = complex(1, 0)
+    assert bool(z)
+    z = complex(0, -1)
+    assert bool(z)
+    z = complex(1, -1)
+    assert bool(z)
+
+
+test_complex_bool()
+
+
 @test
 def test_complex64():
     c64 = complex64
@@ -839,4 +854,14 @@ def test_complex64():
     assert z.real == f32(6.5)
     assert z.imag == f32(0.0)
 
+    z = c64(0, 0)
+    assert not bool(z)
+    z = c64(1, 0)
+    assert bool(z)
+    z = c64(0, -1)
+    assert bool(z)
+    z = c64(1, -1)
+    assert bool(z)
+
+
 test_complex64()