fix: block bitwise ops on decimals (#3219)

it doesn't make too much sense to allow like `x ^ y` for decimals

tests/parser/types/numbers/test_decimals.py

@@ -3,7 +3,7 @@
 
 import pytest
 
-from vyper.exceptions import DecimalOverrideException, TypeMismatch
+from vyper.exceptions import DecimalOverrideException, InvalidOperation, TypeMismatch
 from vyper.utils import DECIMAL_EPSILON, SizeLimits
 
 
@@ -23,6 +23,16 @@ def test_decimal_override():
         )
 
 
+@pytest.mark.parametrize("op", ["**", "&", "|", "^"])
+def test_invalid_ops(get_contract, assert_compile_failed, op):
+    code = f"""
+@external
+def foo(x: decimal, y: decimal) -> decimal:
+    return x {op} y
+    """
+    assert_compile_failed(lambda: get_contract(code), InvalidOperation)
+
+
 def quantize(x: Decimal) -> Decimal:
     return x.quantize(DECIMAL_EPSILON, rounding=ROUND_DOWN)
 

vyper/ast/nodes.pyi

@@ -155,6 +155,9 @@ class Mult(VyperNode): ...
 class Div(VyperNode): ...
 class Mod(VyperNode): ...
 class Pow(VyperNode): ...
+class BitAnd(VyperNode): ...
+class BitOr(VyperNode): ...
+class BitXor(VyperNode): ...
 
 class BoolOp(ExprNode):
     op: VyperNode = ...

vyper/semantics/types/primitives.py

@@ -265,7 +265,7 @@ class DecimalT(NumericT):
     _decimal_places = 10  # TODO generalize
     _id = "decimal"
     _is_signed = True
-    _invalid_ops = (vy_ast.Pow,)
+    _invalid_ops = (vy_ast.Pow, vy_ast.BitAnd, vy_ast.BitOr, vy_ast.BitXor)
     _valid_literal = (vy_ast.Decimal,)
 
     _equality_attrs = ("_bits", "_decimal_places")