moved renamed docs formatted stderr | integral-indexing.rs

Author: Kivooeo

tests/ui/integral-indexing.rs renamed to tests/ui/indexing/indexing-integral-types.rs

@@ -1,14 +1,23 @@
+//! Test that only usize can be used for indexing arrays and slices.
+
 pub fn main() {
     let v: Vec<isize> = vec![0, 1, 2, 3, 4, 5];
     let s: String = "abcdef".to_string();
+
+    // Valid indexing with usize
     v[3_usize];
-    v[3];
+    v[3]; // inferred as usize
+
+    // Invalid indexing with other integral types
     v[3u8];  //~ERROR : the type `[isize]` cannot be indexed by `u8`
     v[3i8];  //~ERROR : the type `[isize]` cannot be indexed by `i8`
     v[3u32]; //~ERROR : the type `[isize]` cannot be indexed by `u32`
     v[3i32]; //~ERROR : the type `[isize]` cannot be indexed by `i32`
+
+    // Same rules apply to byte slices
     s.as_bytes()[3_usize];
-    s.as_bytes()[3];
+    s.as_bytes()[3]; // inferred as usize
+
     s.as_bytes()[3u8];  //~ERROR : the type `[u8]` cannot be indexed by `u8`
     s.as_bytes()[3i8];  //~ERROR : the type `[u8]` cannot be indexed by `i8`
     s.as_bytes()[3u32]; //~ERROR : the type `[u8]` cannot be indexed by `u32`

tests/ui/integral-indexing.stderr renamed to tests/ui/indexing/indexing-integral-types.stderr

@@ -1,5 +1,5 @@
 error[E0277]: the type `[isize]` cannot be indexed by `u8`
-  --> $DIR/integral-indexing.rs:6:7
+  --> $DIR/indexing-integral-types.rs:12:7
    |
 LL |     v[3u8];
    |       ^^^ slice indices are of type `usize` or ranges of `usize`
@@ -11,7 +11,7 @@ LL |     v[3u8];
    = note: required for `Vec<isize>` to implement `Index<u8>`
 
 error[E0277]: the type `[isize]` cannot be indexed by `i8`
-  --> $DIR/integral-indexing.rs:7:7
+  --> $DIR/indexing-integral-types.rs:13:7
    |
 LL |     v[3i8];
    |       ^^^ slice indices are of type `usize` or ranges of `usize`
@@ -23,7 +23,7 @@ LL |     v[3i8];
    = note: required for `Vec<isize>` to implement `Index<i8>`
 
 error[E0277]: the type `[isize]` cannot be indexed by `u32`
-  --> $DIR/integral-indexing.rs:8:7
+  --> $DIR/indexing-integral-types.rs:14:7
    |
 LL |     v[3u32];
    |       ^^^^ slice indices are of type `usize` or ranges of `usize`
@@ -35,7 +35,7 @@ LL |     v[3u32];
    = note: required for `Vec<isize>` to implement `Index<u32>`
 
 error[E0277]: the type `[isize]` cannot be indexed by `i32`
-  --> $DIR/integral-indexing.rs:9:7
+  --> $DIR/indexing-integral-types.rs:15:7
    |
 LL |     v[3i32];
    |       ^^^^ slice indices are of type `usize` or ranges of `usize`
@@ -47,7 +47,7 @@ LL |     v[3i32];
    = note: required for `Vec<isize>` to implement `Index<i32>`
 
 error[E0277]: the type `[u8]` cannot be indexed by `u8`
-  --> $DIR/integral-indexing.rs:12:18
+  --> $DIR/indexing-integral-types.rs:21:18
    |
 LL |     s.as_bytes()[3u8];
    |                  ^^^ slice indices are of type `usize` or ranges of `usize`
@@ -59,7 +59,7 @@ LL |     s.as_bytes()[3u8];
    = note: required for `[u8]` to implement `Index<u8>`
 
 error[E0277]: the type `[u8]` cannot be indexed by `i8`
-  --> $DIR/integral-indexing.rs:13:18
+  --> $DIR/indexing-integral-types.rs:22:18
    |
 LL |     s.as_bytes()[3i8];
    |                  ^^^ slice indices are of type `usize` or ranges of `usize`
@@ -71,7 +71,7 @@ LL |     s.as_bytes()[3i8];
    = note: required for `[u8]` to implement `Index<i8>`
 
 error[E0277]: the type `[u8]` cannot be indexed by `u32`
-  --> $DIR/integral-indexing.rs:14:18
+  --> $DIR/indexing-integral-types.rs:23:18
    |
 LL |     s.as_bytes()[3u32];
    |                  ^^^^ slice indices are of type `usize` or ranges of `usize`
@@ -83,7 +83,7 @@ LL |     s.as_bytes()[3u32];
    = note: required for `[u8]` to implement `Index<u32>`
 
 error[E0277]: the type `[u8]` cannot be indexed by `i32`
-  --> $DIR/integral-indexing.rs:15:18
+  --> $DIR/indexing-integral-types.rs:24:18
    |
 LL |     s.as_bytes()[3i32];
    |                  ^^^^ slice indices are of type `usize` or ranges of `usize`