Fixes doc tests

rust/src/nasl/utils/README.md

@@ -7,6 +7,11 @@ This section briefly describes how to handle errors that occur during builtin fu
 
 
 ```rust
+
+type ArgumentError = String;
+struct InternalError {};
+type BuiltinError = &'static str;
+
 pub enum FnErrorKind {
     Argument(ArgumentError),
     Internal(InternalError),
@@ -26,6 +31,8 @@ As stated above, the metadata (return value, retryable) on how to handle a speci
 ### Return behavior
 The return behavior of a given error specifies how an error should be handled during execution. This is specified by the following type:
 ```rust
+use scannerlib::nasl::NaslValue;
+
 enum ReturnBehavior {
     ExitScript,
     ReturnValue(NaslValue),
@@ -34,32 +41,45 @@ enum ReturnBehavior {
 When the interpreter encounters an error with `ReturnBehavior::ExitScript` behavior, it will unsurprisingly exit the script. If it encounters an error with `ReturnBehavior::ReturnValue(val)`, it will return `val` and continue execution.
 
 In the corresponding `From` impls, the `Argument` and `Internal` variants of `FnError` are automatically constructed with `ReturnBehavior::ExitScript`, meaning that they abort execution of the script. The `Builtin` variant is constructed with `ReturnBehavior::ReturnValue(NaslValue::Null)` by default, but this value can easily be overwritten when the error is created, for example:
-```rust
+```rust,compile_fail
+
+use scannerlib::nasl::prelude::*;
+use scannerlib::nasl::builtin::http::HttpError;
+
+let handle = "/vts".to_string();
+
 HttpError::HandleIdNotFound(handle).with(ReturnValue(-1))
 ```
 
 ### Retry behavior
 Certain errors can be flagged as being solvable by retrying the operation that caused them. This is represented by a `retryable` boolean on `FnError`, which is `false` by default for all variants except for a specific internal error in the storage. However, this default behavior can be overwritten at error creation if needed, for example
-```rust
-HttpError::ConnectionFailed(...).with(Retryable)
+```rust,compile_fail
+
+use scannerlib::nasl::prelude::*;
+use scannerlib::nasl::builtin::http::HttpError;
+
+HttpError::IO(std::io::ErrorKind::ConnectionReset).with(Retryable)
 ```
 I also added a small test to make sure that the interpreter does actually retry retryable errors.
 
 ## How to add a new error type for a builtin module
 1. Add a custom error type for the builtin module. These can be of arbitrary form but a typical error type might look like
 ```rust
+use scannerlib::nasl::prelude::*;
+use thiserror::Error;
+
 #[derive(Debug, Error)]
 enum FooError {
     #[error("Bar occurred.")]
     Bar,
     #[error("Baz occurred. Here is some more data: {0}")]
-    Baz(SomeData),
+    Baz(String),
 }
 ```
 This helps with keeping the error messages all in one place to ensure a common form.
 
 2. Add this builtin error as a variant of the `BuiltinError` type described above.
-```rust
+```rust,compile_fail
 enum BuiltinError {
     ...
     Foo(FooError),
@@ -68,12 +88,12 @@ enum BuiltinError {
 ```
 
 3. For convenience, some `From` impls and `TryFrom` impls can make the error type easier to use by enabling use of the question mark operator. I added a tiny macro that implements these traits (because the implementations are usually trivial), so this comes down to one line too:
-```
+```compile_fail
 builtin_error_variant!(Foo, FooError);
 ```
 
 This is all that is needed to make this error usable in NASL functions:
-```rust
+```rust,compile_fail
 fn check(a: usize) -> Result<(), FooError> {
     if a == 0 {
         Err(FooError::Bar)
@@ -92,7 +112,7 @@ fn foo(a: usize) -> Result<usize, FnError> {
 
 As a side note, NASL functions can also return any concrete `impl Into<FnError>` directly, so for this case we can also write
 
-```rust
+```rust,compile_fail
 #[nasl_function]
 fn foo(a: usize) -> Result<usize, FooError> {
     if a == 0 { 
@@ -106,7 +126,7 @@ fn foo(a: usize) -> Result<usize, FooError> {
 
 Note that the above `From` impls that are automatically written by the `builtin_error_variant!` macro can also be manually implemented if one wants to specify defaults for a specific error variant. For example
 
-```rust
+```rust,compile_fail
 impl From<FooError> for FnError {
     fn from(e: FooError) -> FnError {
         match e {

rust/src/openvas/pref_handler.rs

@@ -97,7 +97,7 @@ where
 
                 // prepare vt preferences
                 for pref in &vt.parameters {
-                    if let Some((prefid, class, name, value)) =
+                    if let Some((prefid, class, name, _value)) =
                         nvt.preferences.iter().find_map(|p| {
                             if let Some(i) = p.id {
                                 if i as u16 == pref.id {