1 files changed, 246 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/question_mark.rs b/src/tools/clippy/tests/ui/question_mark.rs
new file mode 100644
index 000000000..cdbc7b160
--- /dev/null
+++ b/src/tools/clippy/tests/ui/question_mark.rs
@@ -0,0 +1,246 @@
+// run-rustfix
+#![allow(unreachable_code)]
+#![allow(dead_code)]
+#![allow(clippy::unnecessary_wraps)]
+
+fn some_func(a: Option<u32>) -> Option<u32> {
+    if a.is_none() {
+        return None;
+    }
+
+    a
+}
+
+fn some_other_func(a: Option<u32>) -> Option<u32> {
+    if a.is_none() {
+        return None;
+    } else {
+        return Some(0);
+    }
+    unreachable!()
+}
+
+pub enum SeemsOption<T> {
+    Some(T),
+    None,
+}
+
+impl<T> SeemsOption<T> {
+    pub fn is_none(&self) -> bool {
+        match *self {
+            SeemsOption::None => true,
+            SeemsOption::Some(_) => false,
+        }
+    }
+}
+
+fn returns_something_similar_to_option(a: SeemsOption<u32>) -> SeemsOption<u32> {
+    if a.is_none() {
+        return SeemsOption::None;
+    }
+
+    a
+}
+
+pub struct CopyStruct {
+    pub opt: Option<u32>,
+}
+
+impl CopyStruct {
+    #[rustfmt::skip]
+    pub fn func(&self) -> Option<u32> {
+        if (self.opt).is_none() {
+            return None;
+        }
+
+        if self.opt.is_none() {
+            return None
+        }
+
+        let _ = if self.opt.is_none() {
+            return None;
+        } else {
+            self.opt
+        };
+
+        let _ = if let Some(x) = self.opt {
+            x
+        } else {
+            return None;
+        };
+
+        self.opt
+    }
+}
+
+#[derive(Clone)]
+pub struct MoveStruct {
+    pub opt: Option<Vec<u32>>,
+}
+
+impl MoveStruct {
+    pub fn ref_func(&self) -> Option<Vec<u32>> {
+        if self.opt.is_none() {
+            return None;
+        }
+
+        self.opt.clone()
+    }
+
+    pub fn mov_func_reuse(self) -> Option<Vec<u32>> {
+        if self.opt.is_none() {
+            return None;
+        }
+
+        self.opt
+    }
+
+    pub fn mov_func_no_use(self) -> Option<Vec<u32>> {
+        if self.opt.is_none() {
+            return None;
+        }
+        Some(Vec::new())
+    }
+
+    pub fn if_let_ref_func(self) -> Option<Vec<u32>> {
+        let v: &Vec<_> = if let Some(ref v) = self.opt {
+            v
+        } else {
+            return None;
+        };
+
+        Some(v.clone())
+    }
+
+    pub fn if_let_mov_func(self) -> Option<Vec<u32>> {
+        let v = if let Some(v) = self.opt {
+            v
+        } else {
+            return None;
+        };
+
+        Some(v)
+    }
+}
+
+fn func() -> Option<i32> {
+    fn f() -> Option<String> {
+        Some(String::new())
+    }
+
+    if f().is_none() {
+        return None;
+    }
+
+    Some(0)
+}
+
+fn func_returning_result() -> Result<i32, i32> {
+    Ok(1)
+}
+
+fn result_func(x: Result<i32, i32>) -> Result<i32, i32> {
+    let _ = if let Ok(x) = x { x } else { return x };
+
+    if x.is_err() {
+        return x;
+    }
+
+    // No warning
+    let y = if let Ok(x) = x {
+        x
+    } else {
+        return Err(0);
+    };
+
+    // issue #7859
+    // no warning
+    let _ = if let Ok(x) = func_returning_result() {
+        x
+    } else {
+        return Err(0);
+    };
+
+    // no warning
+    if func_returning_result().is_err() {
+        return func_returning_result();
+    }
+
+    Ok(y)
+}
+
+// see issue #8019
+pub enum NotOption {
+    None,
+    First,
+    AfterFirst,
+}
+
+fn obj(_: i32) -> Result<(), NotOption> {
+    Err(NotOption::First)
+}
+
+fn f() -> NotOption {
+    if obj(2).is_err() {
+        return NotOption::None;
+    }
+    NotOption::First
+}
+
+fn do_something() {}
+
+fn err_immediate_return() -> Result<i32, i32> {
+    if let Err(err) = func_returning_result() {
+        return Err(err);
+    }
+    Ok(1)
+}
+
+fn err_immediate_return_and_do_something() -> Result<i32, i32> {
+    if let Err(err) = func_returning_result() {
+        return Err(err);
+    }
+    do_something();
+    Ok(1)
+}
+
+// No warning
+fn no_immediate_return() -> Result<i32, i32> {
+    if let Err(err) = func_returning_result() {
+        do_something();
+        return Err(err);
+    }
+    Ok(1)
+}
+
+// No warning
+fn mixed_result_and_option() -> Option<i32> {
+    if let Err(err) = func_returning_result() {
+        return Some(err);
+    }
+    None
+}
+
+// No warning
+fn else_if_check() -> Result<i32, i32> {
+    if true {
+        Ok(1)
+    } else if let Err(e) = func_returning_result() {
+        Err(e)
+    } else {
+        Err(-1)
+    }
+}
+
+// No warning
+#[allow(clippy::manual_map)]
+#[rustfmt::skip]
+fn option_map() -> Option<bool> {
+    if let Some(a) = Some(false) {
+        Some(!a)
+    } else {
+        None
+    }
+}
+
+fn main() {}