Auto merge of rust-lang#11098 - y21:issue11093, r=giraffate

[`unnecessary_literal_unwrap`]: also lint `unwrap_(err_)unchecked`

Closes rust-lang#11093

changelog: [`unnecessary_literal_unwrap`]: also lint `unwrap_unchecked` and `unwrap_err_unchecked`

Author: bors

clippy_lints/src/methods/mod.rs

@@ -4019,7 +4019,7 @@ impl Methods {
                     }
                     unnecessary_literal_unwrap::check(cx, expr, recv, name, args);
                 },
-                ("unwrap_or_default", []) => {
+                ("unwrap_or_default" | "unwrap_unchecked" | "unwrap_err_unchecked", []) => {
                     unnecessary_literal_unwrap::check(cx, expr, recv, name, args);
                 }
                 ("unwrap_or_else", [u_arg]) => {

clippy_lints/src/methods/unnecessary_literal_unwrap.rs

@@ -67,6 +67,22 @@ pub(super) fn check(
                 (expr.span.with_hi(args[0].span.lo()), "panic!(".to_string()),
                 (expr.span.with_lo(args[0].span.hi()), ")".to_string()),
             ]),
+            ("Some" | "Ok", "unwrap_unchecked", _) | ("Err", "unwrap_err_unchecked", _) => {
+                let mut suggs = vec![
+                    (recv.span.with_hi(call_args[0].span.lo()), String::new()),
+                    (expr.span.with_lo(call_args[0].span.hi()), String::new()),
+                ];
+                // try to also remove the unsafe block if present
+                if let hir::Node::Block(block) = cx.tcx.hir().get_parent(expr.hir_id)
+                    && let hir::BlockCheckMode::UnsafeBlock(hir::UnsafeSource::UserProvided) = block.rules
+                {
+                    suggs.extend([
+                        (block.span.shrink_to_lo().to(expr.span.shrink_to_lo()), String::new()),
+                        (expr.span.shrink_to_hi().to(block.span.shrink_to_hi()), String::new())
+                    ]);
+                }
+                Some(suggs)
+            },
             (_, _, Some(_)) => None,
             ("Ok", "unwrap_err", None) | ("Err", "unwrap", None) => Some(vec![
                 (

tests/ui/unnecessary_literal_unwrap.fixed

@@ -78,11 +78,22 @@ fn unwrap_from_binding() {
     let _ = val.unwrap_or("");
 }
 
+fn unwrap_unchecked() {
+    let _ = 1;
+    let _ = unsafe { 1 + *(&1 as *const i32) }; // needs to keep the unsafe block
+    let _ = 1 + 1;
+    let _ = 1;
+    let _ = unsafe { 1 + *(&1 as *const i32) };
+    let _ = 1 + 1;
+    let _ = 123;
+}
+
 fn main() {
     unwrap_option_some();
     unwrap_option_none();
     unwrap_result_ok();
     unwrap_result_err();
     unwrap_methods_option();
     unwrap_methods_result();
+    unwrap_unchecked();
 }

tests/ui/unnecessary_literal_unwrap.rs

@@ -78,11 +78,22 @@ fn unwrap_from_binding() {
     let _ = val.unwrap_or("");
 }
 
+fn unwrap_unchecked() {
+    let _ = unsafe { Some(1).unwrap_unchecked() };
+    let _ = unsafe { Some(1).unwrap_unchecked() + *(&1 as *const i32) }; // needs to keep the unsafe block
+    let _ = unsafe { Some(1).unwrap_unchecked() } + 1;
+    let _ = unsafe { Ok::<_, ()>(1).unwrap_unchecked() };
+    let _ = unsafe { Ok::<_, ()>(1).unwrap_unchecked() + *(&1 as *const i32) };
+    let _ = unsafe { Ok::<_, ()>(1).unwrap_unchecked() } + 1;
+    let _ = unsafe { Err::<(), i32>(123).unwrap_err_unchecked() };
+}
+
 fn main() {
     unwrap_option_some();
     unwrap_option_none();
     unwrap_result_ok();
     unwrap_result_err();
     unwrap_methods_option();
     unwrap_methods_result();
+    unwrap_unchecked();
 }

tests/ui/unnecessary_literal_unwrap.stderr

@@ -409,5 +409,89 @@ LL -     Ok::<_, ()>(1).unwrap_or_else(|_| 2);
 LL +     1;
    |
 
-error: aborting due to 36 previous errors
+error: used `unwrap_unchecked()` on `Some` value
+  --> $DIR/unnecessary_literal_unwrap.rs:82:22
+   |
+LL |     let _ = unsafe { Some(1).unwrap_unchecked() };
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: remove the `Some` and `unwrap_unchecked()`
+   |
+LL -     let _ = unsafe { Some(1).unwrap_unchecked() };
+LL +     let _ = 1;
+   |
+
+error: used `unwrap_unchecked()` on `Some` value
+  --> $DIR/unnecessary_literal_unwrap.rs:83:22
+   |
+LL |     let _ = unsafe { Some(1).unwrap_unchecked() + *(&1 as *const i32) }; // needs to keep the unsafe block
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: remove the `Some` and `unwrap_unchecked()`
+   |
+LL -     let _ = unsafe { Some(1).unwrap_unchecked() + *(&1 as *const i32) }; // needs to keep the unsafe block
+LL +     let _ = unsafe { 1 + *(&1 as *const i32) }; // needs to keep the unsafe block
+   |
+
+error: used `unwrap_unchecked()` on `Some` value
+  --> $DIR/unnecessary_literal_unwrap.rs:84:22
+   |
+LL |     let _ = unsafe { Some(1).unwrap_unchecked() } + 1;
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: remove the `Some` and `unwrap_unchecked()`
+   |
+LL -     let _ = unsafe { Some(1).unwrap_unchecked() } + 1;
+LL +     let _ = 1 + 1;
+   |
+
+error: used `unwrap_unchecked()` on `Ok` value
+  --> $DIR/unnecessary_literal_unwrap.rs:85:22
+   |
+LL |     let _ = unsafe { Ok::<_, ()>(1).unwrap_unchecked() };
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: remove the `Ok` and `unwrap_unchecked()`
+   |
+LL -     let _ = unsafe { Ok::<_, ()>(1).unwrap_unchecked() };
+LL +     let _ = 1;
+   |
+
+error: used `unwrap_unchecked()` on `Ok` value
+  --> $DIR/unnecessary_literal_unwrap.rs:86:22
+   |
+LL |     let _ = unsafe { Ok::<_, ()>(1).unwrap_unchecked() + *(&1 as *const i32) };
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: remove the `Ok` and `unwrap_unchecked()`
+   |
+LL -     let _ = unsafe { Ok::<_, ()>(1).unwrap_unchecked() + *(&1 as *const i32) };
+LL +     let _ = unsafe { 1 + *(&1 as *const i32) };
+   |
+
+error: used `unwrap_unchecked()` on `Ok` value
+  --> $DIR/unnecessary_literal_unwrap.rs:87:22
+   |
+LL |     let _ = unsafe { Ok::<_, ()>(1).unwrap_unchecked() } + 1;
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: remove the `Ok` and `unwrap_unchecked()`
+   |
+LL -     let _ = unsafe { Ok::<_, ()>(1).unwrap_unchecked() } + 1;
+LL +     let _ = 1 + 1;
+   |
+
+error: used `unwrap_err_unchecked()` on `Err` value
+  --> $DIR/unnecessary_literal_unwrap.rs:88:22
+   |
+LL |     let _ = unsafe { Err::<(), i32>(123).unwrap_err_unchecked() };
+   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: remove the `Err` and `unwrap_err_unchecked()`
+   |
+LL -     let _ = unsafe { Err::<(), i32>(123).unwrap_err_unchecked() };
+LL +     let _ = 123;
+   |
+
+error: aborting due to 43 previous errors