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Add test for normalization during field-lookup on patterns with ascribed types.

Browse source 
As a drive-by, also added test analogous to existing
static_to_a_to_static_through_tuple, but now apply to a struct instead
of a tuple.
This commit is contained in:
Felix S. Klock II 2018-10-25 15:45:41 +02:00
parent f09a0eb9c1
commit 92cbe4772a
2 changed files with 50 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

17
src/test/ui/nll/user-annotations/patterns.rs
View file

@ -41,6 +41,18 @@ fn struct_no_initializer() {
y = &x; //~ ERROR
}
fn struct_no_initializer_must_normalize() {
trait Indirect { type Assoc; }
struct StaticU32;
impl Indirect for StaticU32 { type Assoc = &'static u32; }
struct Single2<T: Indirect> { value: <T as Indirect>::Assoc }
let x = 22;
let Single2 { value: mut _y }: Single2<StaticU32>;
_y = &x; //~ ERROR
}
fn variable_with_initializer() {
let x = 22;
let y: &'static u32 = &x; //~ ERROR
@ -113,6 +125,11 @@ fn static_to_a_to_static_through_tuple<'a>(x: &'a u32) -> &'static u32 {
y //~ ERROR
}
fn static_to_a_to_static_through_struct<'a>(_x: &'a u32) -> &'static u32 {
let Single { value: y }: Single<&'a u32> = Single { value: &22 };
y //~ ERROR
}
fn a_to_static_then_static<'a>(x: &'a u32) -> &'static u32 {
let (y, _z): (&'static u32, u32) = (x, 44); //~ ERROR
y

47
src/test/ui/nll/user-annotations/patterns.stderr
View file

@ -40,7 +40,17 @@ LL | }
| - `x` dropped here while still borrowed
error[E0597]: `x` does not live long enough
--> $DIR/patterns.rs:46:27
--> $DIR/patterns.rs:53:10
|
LL | let Single2 { value: mut _y }: Single2<StaticU32>;
| ------------------ type annotation requires that `x` is borrowed for `'static`
LL | _y = &x; //~ ERROR
| ^^ borrowed value does not live long enough
LL | }
| - `x` dropped here while still borrowed
error[E0597]: `x` does not live long enough
--> $DIR/patterns.rs:58:27
|
LL | let y: &'static u32 = &x; //~ ERROR
| ------------ ^^ borrowed value does not live long enough
@ -50,7 +60,7 @@ LL | }
| - `x` dropped here while still borrowed
error[E0597]: `x` does not live long enough
--> $DIR/patterns.rs:51:27
--> $DIR/patterns.rs:63:27
|
LL | let _: &'static u32 = &x; //~ ERROR
| ------------ ^^ borrowed value does not live long enough
@ -61,7 +71,7 @@ LL | }
| - `x` dropped here while still borrowed
error[E0716]: temporary value dropped while borrowed
--> $DIR/patterns.rs:53:41
--> $DIR/patterns.rs:65:41
|
LL | let _: Vec<&'static String> = vec![&String::new()];
| -------------------- ^^^^^^^^^^^^^ - temporary value is freed at the end of this statement
@ -70,7 +80,7 @@ LL | let _: Vec<&'static String> = vec![&String::new()];
| type annotation requires that borrow lasts for `'static`
error[E0716]: temporary value dropped while borrowed
--> $DIR/patterns.rs:56:52
--> $DIR/patterns.rs:68:52
|
LL | let (_, a): (Vec<&'static String>, _) = (vec![&String::new()], 44);
| ------------------------- ^^^^^^^^^^^^^ - temporary value is freed at the end of this statement
@ -79,7 +89,7 @@ LL | let (_, a): (Vec<&'static String>, _) = (vec![&String::new()], 44);
| type annotation requires that borrow lasts for `'static`
error[E0716]: temporary value dropped while borrowed
--> $DIR/patterns.rs:59:53
--> $DIR/patterns.rs:71:53
|
LL | let (_a, b): (Vec<&'static String>, _) = (vec![&String::new()], 44);
| ------------------------- ^^^^^^^^^^^^^ - temporary value is freed at the end of this statement
@ -88,7 +98,7 @@ LL | let (_a, b): (Vec<&'static String>, _) = (vec![&String::new()], 44);
| type annotation requires that borrow lasts for `'static`
error[E0597]: `x` does not live long enough
--> $DIR/patterns.rs:65:40
--> $DIR/patterns.rs:77:40
|
LL | let (_, _): (&'static u32, u32) = (&x, 44); //~ ERROR
| ------------------- ^^ borrowed value does not live long enough
@ -98,7 +108,7 @@ LL | }
| - `x` dropped here while still borrowed
error[E0597]: `x` does not live long enough
--> $DIR/patterns.rs:70:40
--> $DIR/patterns.rs:82:40
|
LL | let (y, _): (&'static u32, u32) = (&x, 44); //~ ERROR
| ------------------- ^^ borrowed value does not live long enough
@ -108,7 +118,7 @@ LL | }
| - `x` dropped here while still borrowed
error[E0597]: `x` does not live long enough
--> $DIR/patterns.rs:75:69
--> $DIR/patterns.rs:87:69
|
LL | let Single { value: y }: Single<&'static u32> = Single { value: &x }; //~ ERROR
| -------------------- ^^ borrowed value does not live long enough
@ -118,7 +128,7 @@ LL | }
| - `x` dropped here while still borrowed
error[E0597]: `x` does not live long enough
--> $DIR/patterns.rs:80:69
--> $DIR/patterns.rs:92:69
|
LL | let Single { value: _ }: Single<&'static u32> = Single { value: &x }; //~ ERROR
| -------------------- ^^ borrowed value does not live long enough
@ -128,7 +138,7 @@ LL | }
| - `x` dropped here while still borrowed
error[E0597]: `x` does not live long enough
--> $DIR/patterns.rs:88:17
--> $DIR/patterns.rs:100:17
|
LL | let Double { value1: _, value2: _ }: Double<&'static u32> = Double {
| -------------------- type annotation requires that `x` is borrowed for `'static`
@ -139,7 +149,7 @@ LL | }
| - `x` dropped here while still borrowed
error: unsatisfied lifetime constraints
--> $DIR/patterns.rs:101:5
--> $DIR/patterns.rs:113:5
|
LL | fn static_to_a_to_static_through_variable<'a>(x: &'a u32) -> &'static u32 {
| -- lifetime `'a` defined here
@ -148,7 +158,7 @@ LL | y //~ ERROR
| ^ returning this value requires that `'a` must outlive `'static`
error: unsatisfied lifetime constraints
--> $DIR/patterns.rs:113:5
--> $DIR/patterns.rs:125:5
|
LL | fn static_to_a_to_static_through_tuple<'a>(x: &'a u32) -> &'static u32 {
| -- lifetime `'a` defined here
@ -157,14 +167,23 @@ LL | y //~ ERROR
| ^ returning this value requires that `'a` must outlive `'static`
error: unsatisfied lifetime constraints
--> $DIR/patterns.rs:117:18
--> $DIR/patterns.rs:130:5
|
LL | fn static_to_a_to_static_through_struct<'a>(_x: &'a u32) -> &'static u32 {
| -- lifetime `'a` defined here
LL | let Single { value: y }: Single<&'a u32> = Single { value: &22 };
LL | y //~ ERROR
| ^ returning this value requires that `'a` must outlive `'static`
error: unsatisfied lifetime constraints
--> $DIR/patterns.rs:134:18
|
LL | fn a_to_static_then_static<'a>(x: &'a u32) -> &'static u32 {
| -- lifetime `'a` defined here
LL | let (y, _z): (&'static u32, u32) = (x, 44); //~ ERROR
| ^^^^^^^^^^^^^^^^^^^ type annotation requires that `'a` must outlive `'static`
error: aborting due to 17 previous errors
error: aborting due to 19 previous errors
Some errors occurred: E0597, E0716.
For more information about an error, try `rustc --explain E0597`.