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flesh out closure-substs test

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This commit is contained in:
Niko Matsakis 2018-10-22 09:19:33 -04:00
parent 0afccbb654
commit 2921fbaaa8
2 changed files with 66 additions and 8 deletions
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20
src/test/ui/nll/user-annotations/closure-substs.rs
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@ -13,12 +13,30 @@
// Test that we enforce user-provided type annotations on closures.
fn foo<'a>() {
// Here `x` is free in the closure sig:
|x: &'a i32| -> &'static i32 {
return x; //~ ERROR
return x; //~ ERROR unsatisfied lifetime constraints
};
}
fn foo1() {
// Here `x` is bound in the closure sig:
|x: &i32| -> &'static i32 {
return x; //~ ERROR unsatisfied lifetime constraints
//~^ ERROR unsatisfied lifetime constraints
//~| ERROR unsatisfied lifetime constraints
};
}
fn bar<'a>() {
// Here `x` is free in the closure sig:
|x: &'a i32, b: fn(&'static i32)| {
b(x); //~ ERROR unsatisfied lifetime constraints
};
}
fn bar1() {
// Here `x` is bound in the closure sig:
|x: &i32, b: fn(&'static i32)| {
b(x); //~ ERROR
//~^ ERROR borrowed data escapes outside of closure

54
src/test/ui/nll/user-annotations/closure-substs.stderr
View File

@ -1,14 +1,54 @@
error: unsatisfied lifetime constraints
--> $DIR/closure-substs.rs:17:16
--> $DIR/closure-substs.rs:18:16
|
LL | fn foo<'a>() {
| -- lifetime `'a` defined here
LL | |x: &'a i32| -> &'static i32 {
LL | return x; //~ ERROR
...
LL | return x; //~ ERROR unsatisfied lifetime constraints
| ^ returning this value requires that `'a` must outlive `'static`
error: unsatisfied lifetime constraints
--> $DIR/closure-substs.rs:25:16
|
LL | |x: &i32| -> &'static i32 {
| - let's call the lifetime of this reference `'1`
LL | return x; //~ ERROR unsatisfied lifetime constraints
| ^ returning this value requires that `'1` must outlive `'static`
error: unsatisfied lifetime constraints
--> $DIR/closure-substs.rs:25:16
|
LL | |x: &i32| -> &'static i32 {
| - - return type of closure is &'2 i32
| |
| let's call the lifetime of this reference `'1`
LL | return x; //~ ERROR unsatisfied lifetime constraints
| ^ returning this value requires that `'1` must outlive `'2`
error: unsatisfied lifetime constraints
--> $DIR/closure-substs.rs:25:16
|
LL | |x: &i32| -> &'static i32 {
| -------------------------
| | |
| | let's call the lifetime of this reference `'1`
| lifetime `'2` represents this closure's body
LL | return x; //~ ERROR unsatisfied lifetime constraints
| ^ closure was supposed to return data with lifetime `'2` but it is returning data with lifetime `'1`
|
= note: closure implements `Fn`, so references to captured variables can't escape the closure
error: unsatisfied lifetime constraints
--> $DIR/closure-substs.rs:34:9
|
LL | fn bar<'a>() {
| -- lifetime `'a` defined here
...
LL | b(x); //~ ERROR unsatisfied lifetime constraints
| ^^^^ argument requires that `'a` must outlive `'static`
error: borrowed data escapes outside of closure
--> $DIR/closure-substs.rs:23:9
--> $DIR/closure-substs.rs:41:9
|
LL | |x: &i32, b: fn(&'static i32)| {
| - `x` is a reference that is only valid in the closure body
@ -16,7 +56,7 @@ LL | b(x); //~ ERROR
| ^^^^ `x` escapes the closure body here
error: borrowed data escapes outside of closure
--> $DIR/closure-substs.rs:23:9
--> $DIR/closure-substs.rs:41:9
|
LL | |x: &i32, b: fn(&'static i32)| {
| - - `b` is declared here, outside of the closure body
@ -26,7 +66,7 @@ LL | b(x); //~ ERROR
| ^^^^ `x` escapes the closure body here
error: unsatisfied lifetime constraints
--> $DIR/closure-substs.rs:23:9
--> $DIR/closure-substs.rs:41:9
|
LL | |x: &i32, b: fn(&'static i32)| {
| ------------------------------
@ -38,5 +78,5 @@ LL | b(x); //~ ERROR
|
= note: closure implements `Fn`, so references to captured variables can't escape the closure
error: aborting due to 4 previous errors
error: aborting due to 8 previous errors