If a hex literal has an 'd' of 'f' in it, such as '0xf' or '0xd', the compiler fails with illegal tree structure.

The other hex literals work.  The issue is probably related to using `f` and `d` in float and double literals.

```
    public void testHexCollisionDouble() {
        assertEquals(13, exec("return 0xd"));
    }

    public void testHexCollisionFloat() {
        assertEquals(15, exec("return 0xf"));
    }

    public void testHex() throws Exception {
        for (int i = 0; i <= 15; i++) {
            String hex = Integer.toHexString(i);
            if ("d".equals(hex) || "f".equals(hex)) {
                continue;
            }
            assertEquals(i, exec("return 0x" + hex));
            assertEquals(i, exec("return 0x" + hex.toUpperCase(Locale.ROOT)));
            assertEquals(i, exec("return 0X" + hex));
            assertEquals(i, exec("return 0X" + hex.toUpperCase(Locale.ROOT)));
        }
    }
```
modules/lang-painless/src/main/java/org/elasticsearch/painless/phase/DefaultSemanticAnalysisPhase.java
} else {
                    semanticScope.putDecoration(userRightNode, new TargetType(binaryType));
                }
                decorateWithCast(userLeftNode, semanticScope);
                decorateWithCast(userRightNode, semanticScope);
            }
        }
        semanticScope.putDecoration(userBinaryNode, new ValueType(valueType));
        semanticScope.putDecoration(userBinaryNode, new BinaryType(binaryType));
        if (shiftType != null) {
            semanticScope.putDecoration(userBinaryNode, new ShiftType(shiftType));
        }
    }
    /**
     * Visits a boolean comp expression which covers boolean comparision operators.
     * Checks: type validation
     */
    @Override
    public void visitBooleanComp(EBooleanComp userBooleanCompNode, SemanticScope semanticScope) {
        Operation operation = userBooleanCompNode.getOperation();
        if (semanticScope.getCondition(userBooleanCompNode, Write.class)) {
            throw userBooleanCompNode.createError(
                new IllegalArgumentException(
                    "invalid assignment: cannot assign a value to " + operation.name + " operation " + "[" + operation.symbol + "]"
                )
            );
        }
        if (semanticScope.getCondition(userBooleanCompNode, Read.class) == false) {
            throw userBooleanCompNode.createError(
                new IllegalArgumentException(