add test for complex suggestions

Author: mark-i-m

src/test/ui/nll/outlives-suggestion-more.rs

@@ -0,0 +1,28 @@
+// Test the more elaborate outlives suggestions.
+
+#![feature(nll)]
+
+// Should suggest: 'a: 'c, 'b: 'd
+fn foo1<'a, 'b, 'c, 'd>(x: &'a usize, y: &'b usize) -> (&'c usize, &'d usize) {
+    (x, y) //~ERROR lifetime may not live long enough
+           //~^ERROR lifetime may not live long enough
+}
+
+// Should suggest: 'a: 'c and use 'static instead of 'b
+fn foo2<'a, 'b, 'c>(x: &'a usize, y: &'b usize) -> (&'c usize, &'static usize) {
+    (x, y) //~ERROR lifetime may not live long enough
+           //~^ERROR lifetime may not live long enough
+}
+
+// Should suggest: 'a and 'b are the same and use 'static instead of 'c
+fn foo3<'a, 'b, 'c, 'd, 'e>(
+    x: &'a usize,
+    y: &'b usize,
+    z: &'c usize,
+) -> (&'b usize, &'a usize, &'static usize) {
+    (x, y, z) //~ERROR lifetime may not live long enough
+              //~^ERROR lifetime may not live long enough
+              //~^^ERROR lifetime may not live long enough
+}
+
+fn main() {}

src/test/ui/nll/outlives-suggestion-more.stderr

@@ -0,0 +1,100 @@
+error: lifetime may not live long enough
+  --> $DIR/outlives-suggestion-more.rs:7:5
+   |
+LL | fn foo1<'a, 'b, 'c, 'd>(x: &'a usize, y: &'b usize) -> (&'c usize, &'d usize) {
+   |         --      -- lifetime `'c` defined here
+   |         |
+   |         lifetime `'a` defined here
+LL |     (x, y)
+   |     ^^^^^^ returning this value requires that `'a` must outlive `'c`
+   |
+   = help: consider adding the following bound: `'a: 'c`
+
+error: lifetime may not live long enough
+  --> $DIR/outlives-suggestion-more.rs:7:5
+   |
+LL | fn foo1<'a, 'b, 'c, 'd>(x: &'a usize, y: &'b usize) -> (&'c usize, &'d usize) {
+   |             --      -- lifetime `'d` defined here
+   |             |
+   |             lifetime `'b` defined here
+LL |     (x, y)
+   |     ^^^^^^ returning this value requires that `'b` must outlive `'d`
+   |
+   = help: consider adding the following bound: `'b: 'd`
+
+help: the following changes may resolve your lifetime errors
+   |
+   = help: add bound `'a: 'c`
+   = help: add bound `'b: 'd`
+
+error: lifetime may not live long enough
+  --> $DIR/outlives-suggestion-more.rs:13:5
+   |
+LL | fn foo2<'a, 'b, 'c>(x: &'a usize, y: &'b usize) -> (&'c usize, &'static usize) {
+   |         --      -- lifetime `'c` defined here
+   |         |
+   |         lifetime `'a` defined here
+LL |     (x, y)
+   |     ^^^^^^ returning this value requires that `'a` must outlive `'c`
+   |
+   = help: consider adding the following bound: `'a: 'c`
+
+error: lifetime may not live long enough
+  --> $DIR/outlives-suggestion-more.rs:13:5
+   |
+LL | fn foo2<'a, 'b, 'c>(x: &'a usize, y: &'b usize) -> (&'c usize, &'static usize) {
+   |             -- lifetime `'b` defined here
+LL |     (x, y)
+   |     ^^^^^^ returning this value requires that `'b` must outlive `'static`
+   |
+   = help: consider replacing `'b` with `'static`
+
+help: the following changes may resolve your lifetime errors
+   |
+   = help: add bound `'a: 'c`
+   = help: replace `'b` with `'static`
+
+error: lifetime may not live long enough
+  --> $DIR/outlives-suggestion-more.rs:23:5
+   |
+LL | fn foo3<'a, 'b, 'c, 'd, 'e>(
+   |         --  -- lifetime `'b` defined here
+   |         |
+   |         lifetime `'a` defined here
+...
+LL |     (x, y, z)
+   |     ^^^^^^^^^ function was supposed to return data with lifetime `'b` but it is returning data with lifetime `'a`
+   |
+   = help: consider adding the following bound: `'a: 'b`
+
+error: lifetime may not live long enough
+  --> $DIR/outlives-suggestion-more.rs:23:5
+   |
+LL | fn foo3<'a, 'b, 'c, 'd, 'e>(
+   |         --  -- lifetime `'b` defined here
+   |         |
+   |         lifetime `'a` defined here
+...
+LL |     (x, y, z)
+   |     ^^^^^^^^^ function was supposed to return data with lifetime `'a` but it is returning data with lifetime `'b`
+   |
+   = help: consider adding the following bound: `'b: 'a`
+
+error: lifetime may not live long enough
+  --> $DIR/outlives-suggestion-more.rs:23:5
+   |
+LL | fn foo3<'a, 'b, 'c, 'd, 'e>(
+   |                 -- lifetime `'c` defined here
+...
+LL |     (x, y, z)
+   |     ^^^^^^^^^ returning this value requires that `'c` must outlive `'static`
+   |
+   = help: consider replacing `'c` with `'static`
+
+help: the following changes may resolve your lifetime errors
+   |
+   = help: `'a` and `'b` must be the same: replace one with the other
+   = help: replace `'c` with `'static`
+
+error: aborting due to 7 previous errors
+