Use a free error code

src/librustc_borrowck/borrowck/mod.rs

@@ -821,7 +821,7 @@ impl<'a, 'tcx> BorrowckCtxt<'a, 'tcx> {
                     debug!("err_out_of_scope: opt_yield_span = {:?}", yield_span);
                     struct_span_err!(self.tcx.sess,
                                      error_span,
-                                     E0624,
+                                     E0626,
                                      "borrow may still be in use when generator yields")
                         .span_label(yield_span, "possible yield occurs here")
                         .emit();

src/librustc_borrowck/diagnostics.rs

@@ -1183,11 +1183,11 @@ x.x = Some(&y);
 ```
 "##,
 
-E0624: r##"
+E0626: r##"
 This error occurs because a borrow in a generator persists across a
 yield point.
 
-```compile_fail,E0624
+```compile_fail,E0626
 # #![feature(generators, generator_trait)]
 # use std::ops::Generator;
 let mut b = || {
@@ -1222,7 +1222,7 @@ in those cases, something like the `Rc` or `Arc` types may be useful.
 
 This error also frequently arises with iteration:
 
-```compile_fail,E0624
+```compile_fail,E0626
 # #![feature(generators, generator_trait)]
 # use std::ops::Generator;
 let mut b = || {

src/librustc_typeck/check/mod.rs

@@ -3975,7 +3975,7 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
                     self.check_expr_coercable_to_type(&value, ty);
                 }
                 None => {
-                    struct_span_err!(self.tcx.sess, expr.span, E0623,
+                    struct_span_err!(self.tcx.sess, expr.span, E0624,
                                  "yield statement outside of generator literal").emit();
                 }
             }

src/librustc_typeck/diagnostics.rs

@@ -4667,5 +4667,5 @@ register_diagnostics! {
     E0588, // packed struct cannot transitively contain a `[repr(align)]` struct
     E0592, // duplicate definitions with name `{}`
 //  E0613, // Removed (merged with E0609)
-    E0623, // yield statement outside of generator literal
+    E0624, // yield statement outside of generator literal
 }

src/test/ui/generator/yield-in-args-rev.stderr

@@ -1,4 +1,4 @@
-error[E0624]: borrow may still be in use when generator yields
+error[E0626]: borrow may still be in use when generator yields
   --> $DIR/yield-in-args-rev.rs:20:21
    |
 20 |         foo(yield, &b); //~ ERROR

src/test/ui/generator/yield-in-args.stderr

@@ -1,4 +1,4 @@
-error[E0624]: borrow may still be in use when generator yields
+error[E0626]: borrow may still be in use when generator yields
   --> $DIR/yield-in-args.rs:18:14
    |
 18 |         foo(&b, yield); //~ ERROR

src/test/ui/generator/yield-while-iterating.stderr

@@ -1,4 +1,4 @@
-error[E0624]: borrow may still be in use when generator yields
+error[E0626]: borrow may still be in use when generator yields
   --> $DIR/yield-while-iterating.rs:22:19
    |
 22 |         for p in &x { //~ ERROR

src/test/ui/generator/yield-while-local-borrowed.stderr

@@ -1,4 +1,4 @@
-error[E0624]: borrow may still be in use when generator yields
+error[E0626]: borrow may still be in use when generator yields
   --> $DIR/yield-while-local-borrowed.rs:22:18
    |
 22 |         let a = &3; //~ ERROR
@@ -6,7 +6,7 @@ error[E0624]: borrow may still be in use when generator yields
 23 |         yield();
    |         ------- possible yield occurs here
 
-error[E0624]: borrow may still be in use when generator yields
+error[E0626]: borrow may still be in use when generator yields
   --> $DIR/yield-while-local-borrowed.rs:48:22
    |
 48 |             let b = &a; //~ ERROR