use present tense consistently and update references

Author: nikomatsakis

src/librustc/infer/error_reporting/different_lifetimes.rs

@@ -98,12 +98,12 @@ impl<'a, 'gcx, 'tcx> InferCtxt<'a, 'gcx, 'tcx> {
             (None, None) => {
                 let (main_label_1, span_label_1) = if ty_sup == ty_sub {
 
-                    (format!("this type was declared with multiple lifetimes..."),
+                    (format!("this type is declared with multiple lifetimes..."),
                      format!("...but data{} flows{} here",
                              format!(" with one lifetime"),
                              format!(" into the other")))
                 } else {
-                    (format!("these two types was declared with different lifetimes..."),
+                    (format!("these two types are declared with different lifetimes..."),
                      format!("...but data{} flows{} here",
                              span_label_var1,
                              span_label_var2))

src/test/ui/lifetime-errors/ex1-return-one-existing-name-if-else-using-impl.stderr

@@ -8,7 +8,7 @@ error[E0623]: lifetime mismatch
                   with different lifetimes...
 20 | 
 21 |         if x > y { x } else { y }
-   |                    ^ ...but data flows `x` is returned here
+   |                    ^ ...but data from `x` is returned here
 
 error: aborting due to previous error
 

src/test/ui/lifetime-errors/ex1-return-one-existing-name-return-type-is-anon.stderr

@@ -8,7 +8,7 @@ error[E0623]: lifetime mismatch
                   with different lifetimes...
 17 | 
 18 |     x
-   |     ^ ...but data flows from `x` is returned here
+   |     ^ ...but data from `x` is returned here
 
 error: aborting due to previous error
 

src/test/ui/lifetime-errors/ex1-return-one-existing-name-self-is-anon.stderr

@@ -8,7 +8,7 @@ error[E0623]: lifetime mismatch
                   with different lifetimes...
 17 | 
 18 |         if true { x } else { self }
-   |                              ^^^^ ...but data flows from `self` is returned here
+   |                              ^^^^ ...but data from `self` is returned here
 
 error: aborting due to previous error
 

src/test/ui/lifetime-errors/ex3-both-anon-regions-both-are-structs-3.stderr

@@ -4,7 +4,7 @@ error[E0623]: lifetime mismatch
 15 | fn foo(mut x: Ref) {
    |               ---
    |               |
-   |               this type was declared with multiple lifetimes...
+   |               this type is declared with multiple lifetimes...
 16 |     x.a = x.b;
    |           ^^^ ...but data with one lifetime flows into the other here