Add allow-invalid configuration option for disallowed_* to the documentation

Author: alex-semenyuk

book/src/lint_configuration.md

@@ -477,6 +477,12 @@ The maximum cognitive complexity a function can have
 
 ## `disallowed-macros`
 The list of disallowed macros, written as fully qualified paths.
+Fields:
+path (required): the fully qualified path to the macro that should be disallowed;
+reason (optional): explanation why this macro is disallowed;
+replacement (optional): suggested alternative macro;
+allow-invalid (optional, false by default): when set to true, it will ignore this entry
+if the path doesn't exist, instead of emitting an error.
 
 **Default Value:** `[]`
 
@@ -487,6 +493,12 @@ The list of disallowed macros, written as fully qualified paths.
 
 ## `disallowed-methods`
 The list of disallowed methods, written as fully qualified paths.
+Fields:
+path (required): the fully qualified path to the method that should be disallowed;
+reason (optional): explanation why this method is disallowed;
+replacement (optional): suggested alternative method;
+allow-invalid (optional, false by default): when set to true, it will ignore this entry
+if the path doesn't exist, instead of emitting an error.
 
 **Default Value:** `[]`
 
@@ -509,6 +521,12 @@ default configuration of Clippy. By default, any configuration will replace the
 
 ## `disallowed-types`
 The list of disallowed types, written as fully qualified paths.
+Fields:
+path (required): the fully qualified path to the type that should be disallowed;
+reason (optional): explanation why this type is disallowed;
+replacement (optional): suggested alternative type;
+allow-invalid (optional, false by default): when set to true, it will ignore this entry
+if the path doesn't exist, instead of emitting an error.
 
 **Default Value:** `[]`
 

clippy_config/src/conf.rs

@@ -572,10 +572,22 @@ define_Conf! {
     #[conf_deprecated("Please use `cognitive-complexity-threshold` instead", cognitive_complexity_threshold)]
     cyclomatic_complexity_threshold: u64 = 25,
     /// The list of disallowed macros, written as fully qualified paths.
+    /// Fields:
+    /// path (required): the fully qualified path to the macro that should be disallowed;
+    /// reason (optional): explanation why this macro is disallowed;
+    /// replacement (optional): suggested alternative macro;
+    /// allow-invalid (optional, false by default): when set to true, it will ignore this entry
+    /// if the path doesn't exist, instead of emitting an error.
     #[disallowed_paths_allow_replacements = true]
     #[lints(disallowed_macros)]
     disallowed_macros: Vec<DisallowedPath> = Vec::new(),
     /// The list of disallowed methods, written as fully qualified paths.
+    /// Fields:
+    /// path (required): the fully qualified path to the method that should be disallowed;
+    /// reason (optional): explanation why this method is disallowed;
+    /// replacement (optional): suggested alternative method;
+    /// allow-invalid (optional, false by default): when set to true, it will ignore this entry
+    /// if the path doesn't exist, instead of emitting an error.
     #[disallowed_paths_allow_replacements = true]
     #[lints(disallowed_methods)]
     disallowed_methods: Vec<DisallowedPath> = Vec::new(),
@@ -585,6 +597,12 @@ define_Conf! {
     #[lints(disallowed_names)]
     disallowed_names: Vec<String> = DEFAULT_DISALLOWED_NAMES.iter().map(ToString::to_string).collect(),
     /// The list of disallowed types, written as fully qualified paths.
+    /// Fields:
+    /// path (required): the fully qualified path to the type that should be disallowed;
+    /// reason (optional): explanation why this type is disallowed;
+    /// replacement (optional): suggested alternative type;
+    /// allow-invalid (optional, false by default): when set to true, it will ignore this entry
+    /// if the path doesn't exist, instead of emitting an error.
     #[disallowed_paths_allow_replacements = true]
     #[lints(disallowed_types)]
     disallowed_types: Vec<DisallowedPath> = Vec::new(),

clippy_lints/src/disallowed_macros.rs

@@ -38,6 +38,9 @@ declare_clippy_lint! {
     ///     # When using an inline table, can add a `reason` for why the macro
     ///     # is disallowed.
     ///     { path = "serde::Serialize", reason = "no serializing" },
+    ///     # This would normally error if the path is incorrect, but with allow-invalid = true,
+    ///     # it will be silently ignored
+    ///     { path = "std::invalid_macro", reason = "use alternative instead", allow-invalid = true }
     /// ]
     /// ```
     /// ```no_run

clippy_lints/src/disallowed_methods.rs

@@ -33,6 +33,9 @@ declare_clippy_lint! {
     ///     { path = "std::vec::Vec::leak", reason = "no leaking memory" },
     ///     # Can also add a `replacement` that will be offered as a suggestion.
     ///     { path = "std::sync::Mutex::new", reason = "prefer faster & simpler non-poisonable mutex", replacement = "parking_lot::Mutex::new" },
+    ///     # This would normally error if the path is incorrect, but with allow-invalid = true,
+    ///     # it will be silently ignored
+    ///     { path = "std::fs::InvalidPath", reason = "use alternative instead", allow-invalid = true },
     /// ]
     /// ```
     ///

clippy_lints/src/disallowed_types.rs

@@ -34,6 +34,9 @@ declare_clippy_lint! {
     ///     { path = "std::net::Ipv4Addr", reason = "no IPv4 allowed" },
     ///     # Can also add a `replacement` that will be offered as a suggestion.
     ///     { path = "std::sync::Mutex", reason = "prefer faster & simpler non-poisonable mutex", replacement = "parking_lot::Mutex" },
+    ///     # This would normally error if the path is incorrect, but with allow-invalid = true,
+    ///     # it will be silently ignored
+    ///     { path = "std::invalid::Type", reason = "use alternative instead", allow-invalid = true }
     /// ]
     /// ```
     ///