Fix tests with inclusive ranges

Author: mcarton

src/loops.rs

@@ -10,6 +10,7 @@ use rustc_front::hir::*;
 use rustc_front::intravisit::{Visitor, walk_expr, walk_block, walk_decl};
 use std::borrow::Cow;
 use std::collections::HashMap;
+use syntax::ast;
 
 use utils::{snippet, span_lint, get_parent_expr, match_trait_method, match_type, in_external_macro,
             span_help_and_lint, is_integer_literal, get_enclosing_block, span_lint_and_then,
@@ -417,7 +418,7 @@ fn is_len_call(expr: &Expr, var: &Name) -> bool {
 
 fn check_for_loop_reverse_range(cx: &LateContext, arg: &Expr, expr: &Expr) {
     // if this for loop is iterating over a two-sided range...
-    if let Some(UnsugaredRange { start: Some(ref start), end: Some(ref end), .. }) = unsugar_range(&arg) {
+    if let Some(UnsugaredRange { start: Some(ref start), end: Some(ref end), limits }) = unsugar_range(&arg) {
         // ...and both sides are compile-time constant integers...
         if let Ok(start_idx) = eval_const_expr_partial(&cx.tcx, start, ExprTypeChecked, None) {
             if let Ok(end_idx) = eval_const_expr_partial(&cx.tcx, end, ExprTypeChecked, None) {
@@ -450,7 +451,7 @@ fn check_for_loop_reverse_range(cx: &LateContext, arg: &Expr, expr: &Expr) {
                                                                over this range in reverse",
                                                               format!("({}..{}).rev()` ", end_snippet, start_snippet));
                                        });
-                } else if eq {
+                } else if eq && limits != ast::RangeLimits::Closed {
                     // if they are equal, it's also problematic - this loop
                     // will never run.
                     span_lint(cx,

tests/compile-fail/for_loop.rs

@@ -1,4 +1,4 @@
-#![feature(plugin, step_by)]
+#![feature(plugin, step_by, inclusive_range_syntax)]
 #![plugin(clippy)]
 
 use std::collections::*;
@@ -118,11 +118,21 @@ fn main() {
         println!("{}", vec[i]);
     }
 
+    for i in 0...MAX_LEN {
+        //~^ ERROR `i` is only used to index `vec`. Consider using `for item in vec.iter().take(MAX_LEN)`
+        println!("{}", vec[i]);
+    }
+
     for i in 5..10 {
         //~^ ERROR `i` is only used to index `vec`. Consider using `for item in vec.iter().take(10).skip(5)`
         println!("{}", vec[i]);
     }
 
+    for i in 5...10 {
+        //~^ ERROR `i` is only used to index `vec`. Consider using `for item in vec.iter().take(10).skip(5)`
+        println!("{}", vec[i]);
+    }
+
     for i in 5..vec.len() {
         //~^ ERROR `i` is used to index `vec`. Consider using `for (i, item) in vec.iter().enumerate().skip(5)`
         println!("{} {}", vec[i], i);
@@ -140,6 +150,13 @@ fn main() {
         println!("{}", i);
     }
 
+    for i in 10...0 {
+        //~^ERROR this range is empty so this for loop will never run
+        //~|HELP consider
+        //~|SUGGESTION (0..10).rev()
+        println!("{}", i);
+    }
+
     for i in MAX_LEN..0 { //~ERROR this range is empty so this for loop will never run
         //~|HELP consider
         //~|SUGGESTION (0..MAX_LEN).rev()
@@ -150,6 +167,10 @@ fn main() {
         println!("{}", i);
     }
 
+    for i in 5...5 { // not an error, this is the range with only one element “5”
+        println!("{}", i);
+    }
+
     for i in 0..10 { // not an error, the start index is less than the end index
         println!("{}", i);
     }