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
returnType = def.class;
            
            typeParameters = new ArrayList<>(canonicalTypeNameParameters.size());
            for (String type : canonicalTypeNameParameters) {
                if (type == null) {
                    typeParameters.add(def.class);
                } else {
                    Class<?> typeParameter = scriptScope.getPainlessLookup().canonicalTypeNameToType(type);
                    if (typeParameter == null) {
                        throw userLambdaNode.createError(new IllegalArgumentException("cannot resolve type [" + type + "]"));
                    }
                    typeParameters.add(typeParameter);
                }
            }
        } else {
            
            interfaceMethod = scriptScope.getPainlessLookup().lookupFunctionalInterfacePainlessMethod(targetType.targetType());
            if (interfaceMethod == null) {
                throw userLambdaNode.createError(
                    new IllegalArgumentException(
                        "Cannot pass lambda to " + "[" + targetType.getTargetCanonicalTypeName() + "], not a functional interface"
                    )
                );
            }
            
            if (interfaceMethod.typeParameters().size() != canonicalTypeNameParameters.size()) throw new IllegalArgumentException(
                "Incorrect number of parameters for ["
                    + interfaceMethod.javaMethod().getName()
                    + "] in ["
                    + targetType.getTargetCanonicalTypeName()