Auto merge of #4149 - flip1995:rollup-6knpdqb, r=flip1995

Rollup of 2 pull requests

Successful merges:

 - #4102 (Fix match_same_arms to fail late)
 - #4119 (Improve non ascii literal)

Failed merges:

r? @ghost

Author: bors

clippy_lints/src/copies.rs

@@ -152,7 +152,7 @@ fn lint_same_cond(cx: &LateContext<'_, '_>, conds: &[&Expr]) {
     let eq: &dyn Fn(&&Expr, &&Expr) -> bool =
         &|&lhs, &rhs| -> bool { SpanlessEq::new(cx).ignore_fn().eq_expr(lhs, rhs) };
 
-    if let Some((i, j)) = search_same(conds, hash, eq) {
+    for (i, j) in search_same(conds, hash, eq) {
         span_note_and_lint(
             cx,
             IFS_SAME_COND,
@@ -185,7 +185,7 @@ fn lint_match_arms(cx: &LateContext<'_, '_>, expr: &Expr) {
         };
 
         let indexed_arms: Vec<(usize, &Arm)> = arms.iter().enumerate().collect();
-        if let Some((&(_, i), &(_, j))) = search_same(&indexed_arms, hash, eq) {
+        for (&(_, i), &(_, j)) in search_same(&indexed_arms, hash, eq) {
             span_lint_and_then(
                 cx,
                 MATCH_SAME_ARMS,
@@ -217,7 +217,10 @@ fn lint_match_arms(cx: &LateContext<'_, '_>, expr: &Expr) {
                                 ),
                             );
                         } else {
-                            db.span_note(i.body.span, &format!("consider refactoring into `{} | {}`", lhs, rhs));
+                            db.span_help(
+                                i.pats[0].span,
+                                &format!("consider refactoring into `{} | {}`", lhs, rhs),
+                            );
                         }
                     }
                 },
@@ -323,21 +326,33 @@ where
     None
 }
 
-fn search_same<T, Hash, Eq>(exprs: &[T], hash: Hash, eq: Eq) -> Option<(&T, &T)>
+fn search_common_cases<'a, T, Eq>(exprs: &'a [T], eq: &Eq) -> Option<(&'a T, &'a T)>
 where
-    Hash: Fn(&T) -> u64,
     Eq: Fn(&T, &T) -> bool,
 {
-    // common cases
     if exprs.len() < 2 {
-        return None;
+        None
     } else if exprs.len() == 2 {
-        return if eq(&exprs[0], &exprs[1]) {
+        if eq(&exprs[0], &exprs[1]) {
             Some((&exprs[0], &exprs[1]))
         } else {
             None
-        };
+        }
+    } else {
+        None
     }
+}
+
+fn search_same<T, Hash, Eq>(exprs: &[T], hash: Hash, eq: Eq) -> Vec<(&T, &T)>
+where
+    Hash: Fn(&T) -> u64,
+    Eq: Fn(&T, &T) -> bool,
+{
+    if let Some(expr) = search_common_cases(&exprs, &eq) {
+        return vec![expr];
+    }
+
+    let mut match_expr_list: Vec<(&T, &T)> = Vec::new();
 
     let mut map: FxHashMap<_, Vec<&_>> =
         FxHashMap::with_capacity_and_hasher(exprs.len(), BuildHasherDefault::default());
@@ -347,7 +362,7 @@ where
             Entry::Occupied(mut o) => {
                 for o in o.get() {
                     if eq(o, expr) {
-                        return Some((o, expr));
+                        match_expr_list.push((o, expr));
                     }
                 }
                 o.get_mut().push(expr);
@@ -358,5 +373,5 @@ where
         }
     }
 
-    None
+    match_expr_list
 }

clippy_lints/src/unicode.rs

@@ -1,7 +1,8 @@
-use crate::utils::{is_allowed, snippet, span_help_and_lint};
+use crate::utils::{is_allowed, snippet, span_lint_and_sugg};
 use rustc::hir::*;
 use rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
 use rustc::{declare_lint_pass, declare_tool_lint};
+use rustc_errors::Applicability;
 use syntax::ast::LitKind;
 use syntax::source_map::Span;
 use unicode_normalization::UnicodeNormalization;
@@ -34,7 +35,11 @@ declare_clippy_lint! {
     ///
     /// **Example:**
     /// ```rust
-    /// let x = "Hä?"
+    /// let x = String::from("€");
+    /// ```
+    /// Could be written as:
+    /// ```rust
+    /// let x = String::from("\u{20ac}");
     /// ```
     pub NON_ASCII_LITERAL,
     pedantic,
@@ -87,43 +92,40 @@ fn escape<T: Iterator<Item = char>>(s: T) -> String {
 fn check_str(cx: &LateContext<'_, '_>, span: Span, id: HirId) {
     let string = snippet(cx, span, "");
     if string.contains('\u{200B}') {
-        span_help_and_lint(
+        span_lint_and_sugg(
             cx,
             ZERO_WIDTH_SPACE,
             span,
             "zero-width space detected",
-            &format!(
-                "Consider replacing the string with:\n\"{}\"",
-                string.replace("\u{200B}", "\\u{200B}")
-            ),
+            "consider replacing the string with",
+            string.replace("\u{200B}", "\\u{200B}"),
+            Applicability::MachineApplicable,
         );
     }
     if string.chars().any(|c| c as u32 > 0x7F) {
-        span_help_and_lint(
+        span_lint_and_sugg(
             cx,
             NON_ASCII_LITERAL,
             span,
             "literal non-ASCII character detected",
-            &format!(
-                "Consider replacing the string with:\n\"{}\"",
-                if is_allowed(cx, UNICODE_NOT_NFC, id) {
-                    escape(string.chars())
-                } else {
-                    escape(string.nfc())
-                }
-            ),
+            "consider replacing the string with",
+            if is_allowed(cx, UNICODE_NOT_NFC, id) {
+                escape(string.chars())
+            } else {
+                escape(string.nfc())
+            },
+            Applicability::MachineApplicable,
         );
     }
     if is_allowed(cx, NON_ASCII_LITERAL, id) && string.chars().zip(string.nfc()).any(|(a, b)| a != b) {
-        span_help_and_lint(
+        span_lint_and_sugg(
             cx,
             UNICODE_NOT_NFC,
             span,
             "non-nfc unicode sequence detected",
-            &format!(
-                "Consider replacing the string with:\n\"{}\"",
-                string.nfc().collect::<String>()
-            ),
+            "consider replacing the string with",
+            string.nfc().collect::<String>(),
+            Applicability::MachineApplicable,
         );
     }
 }

tests/ui/if_same_then_else.rs

@@ -232,6 +232,20 @@ fn if_same_then_else() -> Result<&'static str, ()> {
         return Ok(&foo[0..]);
     }
 
+    if true {
+        let foo = "";
+        return Ok(&foo[0..]);
+    } else if false {
+        let foo = "bar";
+        return Ok(&foo[0..]);
+    } else if true {
+        let foo = "";
+        return Ok(&foo[0..]);
+    } else {
+        let foo = "";
+        return Ok(&foo[0..]);
+    }
+
     // False positive `if_same_then_else`: `let (x, y)` vs. `let (y, x)`; see issue #3559.
     if true {
         let foo = "";

tests/ui/if_same_then_else.stderr

@@ -210,5 +210,38 @@ LL | |         try!(Ok("foo"));
 LL | |     } else {
    | |_____^
 
-error: aborting due to 10 previous errors
+error: this `if` has identical blocks
+  --> $DIR/if_same_then_else.rs:244:12
+   |
+LL |       } else {
+   |  ____________^
+LL | |         let foo = "";
+LL | |         return Ok(&foo[0..]);
+LL | |     }
+   | |_____^
+   |
+note: same as this
+  --> $DIR/if_same_then_else.rs:241:20
+   |
+LL |       } else if true {
+   |  ____________________^
+LL | |         let foo = "";
+LL | |         return Ok(&foo[0..]);
+LL | |     } else {
+   | |_____^
+
+error: this `if` has the same condition as a previous if
+  --> $DIR/if_same_then_else.rs:241:15
+   |
+LL |     } else if true {
+   |               ^^^^
+   |
+   = note: #[deny(clippy::ifs_same_cond)] on by default
+note: same as this
+  --> $DIR/if_same_then_else.rs:235:8
+   |
+LL |     if true {
+   |        ^^^^
+
+error: aborting due to 12 previous errors
 

tests/ui/match_same_arms.rs

@@ -108,6 +108,22 @@ fn match_same_arms() {
         (None, Some(a)) => bar(a), // bindings have different types
         _ => (),
     }
+
+    let _ = match 42 {
+        42 => 1,
+        51 => 1, //~ ERROR match arms have same body
+        41 => 2,
+        52 => 2, //~ ERROR match arms have same body
+        _ => 0,
+    };
+
+    let _ = match 42 {
+        1 => 2,
+        2 => 2, //~ ERROR 2nd matched arms have same body
+        3 => 2, //~ ERROR 3rd matched arms have same body
+        4 => 3,
+        _ => 0,
+    };
 }
 
 fn main() {}