add better example and change pedantic to restriction

Author: basil-cow

README.md

@@ -6,11 +6,7 @@
 
 A collection of lints to catch common mistakes and improve your [Rust](https://github.com/rust-lang/rust) code.
 
-<<<<<<< HEAD
-[There are 337 lints included in this crate!](https://rust-lang.github.io/rust-clippy/master/index.html)
-=======
-[There are 334 lints included in this crate!](https://rust-lang.github.io/rust-clippy/master/index.html)
->>>>>>> implemented `as_conversions` lint
+[There are 338 lints included in this crate!](https://rust-lang.github.io/rust-clippy/master/index.html)
 
 We have a bunch of lint categories to allow you to choose how much Clippy is supposed to ~~annoy~~ help you:
 

clippy_lints/src/as_conversions.rs

@@ -9,18 +9,29 @@ declare_clippy_lint! {
     ///
     /// **Why is this bad?** `as` conversions will perform many kinds of
     /// conversions, including silently lossy conversions and dangerous coercions.
-    /// There are cases when it's necessary to use `as`, so the lint is
+    /// There are cases when it makes sense to use `as`, so the lint is
     /// Allow by default.
     ///
     /// **Known problems:** None.
     ///
     /// **Example:**
-    /// ```rust
-    /// let a: u32 = 0;
-    /// let p = &a as *const u32 as *mut u32;
+    /// ```rust,ignore
+    /// let a: u32;
+    /// ...
+    /// f(a as u16);
     /// ```
+    ///
+    /// Usually better represents the semantics you expect:
+    /// ```rust,ignore
+    /// f(a.try_into()?);
+    /// ```
+    /// or
+    /// ```rust,ignore
+    /// f(a.try_into().expect("Unexpected u16 overflow in f"));
+    /// ```
+    ///
     pub AS_CONVERSIONS,
-    pedantic,
+    restriction,
     "using a potentially dangerous silent `as` conversion"
 }
 

clippy_lints/src/lib.rs

@@ -966,6 +966,7 @@ pub fn register_plugins(store: &mut lint::LintStore, sess: &Session, conf: &Conf
     store.register_group(true, "clippy::restriction", Some("clippy_restriction"), vec![
         LintId::of(&arithmetic::FLOAT_ARITHMETIC),
         LintId::of(&arithmetic::INTEGER_ARITHMETIC),
+        LintId::of(&as_conversions::AS_CONVERSIONS),
         LintId::of(&dbg_macro::DBG_MACRO),
         LintId::of(&else_if_without_else::ELSE_IF_WITHOUT_ELSE),
         LintId::of(&exit::EXIT),
@@ -998,7 +999,6 @@ pub fn register_plugins(store: &mut lint::LintStore, sess: &Session, conf: &Conf
     ]);
 
     store.register_group(true, "clippy::pedantic", Some("clippy_pedantic"), vec![
-        LintId::of(&as_conversions::AS_CONVERSIONS),
         LintId::of(&attrs::INLINE_ALWAYS),
         LintId::of(&checked_conversions::CHECKED_CONVERSIONS),
         LintId::of(&copies::MATCH_SAME_ARMS),

src/lintlist/mod.rs

@@ -6,7 +6,7 @@ pub use lint::Lint;
 pub use lint::LINT_LEVELS;
 
 // begin lint list, do not remove this comment, it’s used in `update_lints`
-pub const ALL_LINTS: [Lint; 337] = [
+pub const ALL_LINTS: [Lint; 338] = [
     Lint {
         name: "absurd_extreme_comparisons",
         group: "correctness",
@@ -30,8 +30,8 @@ pub const ALL_LINTS: [Lint; 337] = [
     },
     Lint {
         name: "as_conversions",
-        group: "pedantic",
-        desc: "a potentially dangerous silent `as` conversion",
+        group: "restriction",
+        desc: "using a potentially dangerous silent `as` conversion",
         deprecation: None,
         module: "as_conversions",
     },