promote-not: add test that distinguishes promotion from outer scope rule
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Ralf Jung
parent
279465b5e8
commit
fb802f2e6e
@ -40,7 +40,16 @@ pub const fn promote_union() {
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let _val: &'static _ = &(Cell::new(1), 2).1; //~ ERROR temporary value dropped while borrowed
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};
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const TEST_DROP: String = String::new();
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// This gets accepted by the "outer scope" rule, not promotion.
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const TEST_DROP_OUTER_SCOPE: &String = &String::new();
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// To demonstrate that, we can rewrite it as follows. If this was promotion it would still work.
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const TEST_DROP_NOT_PROMOTE: &String = {
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let x = &String::new(); //~ ERROR destructor of `String` cannot be evaluated at compile-time
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// The "dropped while borrowed" error seems to be suppressed, but the key point is that this
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// fails to compile.
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x
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};
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fn main() {
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// We must not promote things with interior mutability. Not even if we "project it away".
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@ -59,6 +68,7 @@ fn main() {
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let _val: &'static _ = &([1,2,3][4]+1); //~ ERROR temporary value dropped while borrowed
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// No promotion of temporaries that need to be dropped.
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const TEST_DROP: String = String::new();
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let _val: &'static _ = &TEST_DROP;
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//~^ ERROR temporary value dropped while borrowed
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let _val: &'static _ = &&TEST_DROP;
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@ -38,6 +38,15 @@ LL | let _val: &'static _ = &(Cell::new(1), 2).1;
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LL | };
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| - temporary value is freed at the end of this statement
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error[E0493]: destructor of `String` cannot be evaluated at compile-time
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--> $DIR/promote-not.rs:47:14
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LL | let x = &String::new();
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| ^^^^^^^^^^^^^ the destructor for this type cannot be evaluated in constants
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...
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LL | };
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| - value is dropped here
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/promote-not.rs:21:32
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@ -59,7 +68,7 @@ LL | }
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| - temporary value is freed at the end of this statement
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/promote-not.rs:47:29
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--> $DIR/promote-not.rs:56:29
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LL | let _val: &'static _ = &(Cell::new(1), 2).0;
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| ---------- ^^^^^^^^^^^^^^^^^ creates a temporary value which is freed while still in use
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@ -70,7 +79,7 @@ LL | }
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| - temporary value is freed at the end of this statement
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/promote-not.rs:48:29
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--> $DIR/promote-not.rs:57:29
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LL | let _val: &'static _ = &(Cell::new(1), 2).1;
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| ---------- ^^^^^^^^^^^^^^^^^ creates a temporary value which is freed while still in use
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@ -81,7 +90,7 @@ LL | }
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| - temporary value is freed at the end of this statement
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/promote-not.rs:51:29
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--> $DIR/promote-not.rs:60:29
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LL | let _val: &'static _ = &(1/0);
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| ---------- ^^^^^ creates a temporary value which is freed while still in use
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@ -92,7 +101,7 @@ LL | }
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| - temporary value is freed at the end of this statement
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/promote-not.rs:52:29
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--> $DIR/promote-not.rs:61:29
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LL | let _val: &'static _ = &(1/(1-1));
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| ---------- ^^^^^^^^^ creates a temporary value which is freed while still in use
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@ -103,7 +112,7 @@ LL | }
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| - temporary value is freed at the end of this statement
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/promote-not.rs:53:29
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--> $DIR/promote-not.rs:62:29
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LL | let _val: &'static _ = &((1+1)/(1-1));
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| ---------- ^^^^^^^^^^^^^ creates a temporary value which is freed while still in use
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@ -114,7 +123,7 @@ LL | }
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| - temporary value is freed at the end of this statement
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/promote-not.rs:54:29
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--> $DIR/promote-not.rs:63:29
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LL | let _val: &'static _ = &(i32::MIN/-1);
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| ---------- ^^^^^^^^^^^^^ creates a temporary value which is freed while still in use
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@ -125,7 +134,7 @@ LL | }
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| - temporary value is freed at the end of this statement
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/promote-not.rs:55:29
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--> $DIR/promote-not.rs:64:29
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LL | let _val: &'static _ = &(i32::MIN/(0-1));
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| ---------- ^^^^^^^^^^^^^^^^ creates a temporary value which is freed while still in use
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@ -136,7 +145,7 @@ LL | }
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| - temporary value is freed at the end of this statement
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/promote-not.rs:56:29
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--> $DIR/promote-not.rs:65:29
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LL | let _val: &'static _ = &(-128i8/-1);
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| ---------- ^^^^^^^^^^^ creates a temporary value which is freed while still in use
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@ -147,7 +156,7 @@ LL | }
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| - temporary value is freed at the end of this statement
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/promote-not.rs:57:29
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--> $DIR/promote-not.rs:66:29
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LL | let _val: &'static _ = &(1%0);
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| ---------- ^^^^^ creates a temporary value which is freed while still in use
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@ -158,7 +167,7 @@ LL | }
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| - temporary value is freed at the end of this statement
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/promote-not.rs:58:29
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--> $DIR/promote-not.rs:67:29
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LL | let _val: &'static _ = &(1%(1-1));
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| ---------- ^^^^^^^^^ creates a temporary value which is freed while still in use
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@ -169,7 +178,7 @@ LL | }
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| - temporary value is freed at the end of this statement
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/promote-not.rs:59:29
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--> $DIR/promote-not.rs:68:29
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LL | let _val: &'static _ = &([1,2,3][4]+1);
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| ---------- ^^^^^^^^^^^^^^ creates a temporary value which is freed while still in use
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@ -180,7 +189,7 @@ LL | }
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| - temporary value is freed at the end of this statement
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/promote-not.rs:62:29
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--> $DIR/promote-not.rs:72:29
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LL | let _val: &'static _ = &TEST_DROP;
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| ---------- ^^^^^^^^^ creates a temporary value which is freed while still in use
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@ -191,7 +200,7 @@ LL | }
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| - temporary value is freed at the end of this statement
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/promote-not.rs:64:29
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--> $DIR/promote-not.rs:74:29
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LL | let _val: &'static _ = &&TEST_DROP;
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| ---------- ^^^^^^^^^^ creates a temporary value which is freed while still in use
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@ -202,7 +211,7 @@ LL | }
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| - temporary value is freed at the end of this statement
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/promote-not.rs:64:30
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--> $DIR/promote-not.rs:74:30
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LL | let _val: &'static _ = &&TEST_DROP;
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| ---------- ^^^^^^^^^ creates a temporary value which is freed while still in use
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@ -213,7 +222,7 @@ LL | }
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| - temporary value is freed at the end of this statement
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/promote-not.rs:67:29
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--> $DIR/promote-not.rs:77:29
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LL | let _val: &'static _ = &(&TEST_DROP,);
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| ---------- ^^^^^^^^^^^^^ creates a temporary value which is freed while still in use
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@ -224,7 +233,7 @@ LL | }
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| - temporary value is freed at the end of this statement
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/promote-not.rs:67:31
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--> $DIR/promote-not.rs:77:31
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LL | let _val: &'static _ = &(&TEST_DROP,);
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| ---------- ^^^^^^^^^ creates a temporary value which is freed while still in use
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@ -235,7 +244,7 @@ LL | }
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| - temporary value is freed at the end of this statement
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/promote-not.rs:70:29
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--> $DIR/promote-not.rs:80:29
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LL | let _val: &'static _ = &[&TEST_DROP; 1];
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| ---------- ^^^^^^^^^^^^^^^ creates a temporary value which is freed while still in use
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@ -246,7 +255,7 @@ LL | }
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| - temporary value is freed at the end of this statement
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/promote-not.rs:70:31
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--> $DIR/promote-not.rs:80:31
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LL | let _val: &'static _ = &[&TEST_DROP; 1];
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| ---------- ^^^^^^^^^ - temporary value is freed at the end of this statement
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@ -255,7 +264,7 @@ LL | let _val: &'static _ = &[&TEST_DROP; 1];
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| type annotation requires that borrow lasts for `'static`
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error[E0716]: temporary value dropped while borrowed
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--> $DIR/promote-not.rs:79:26
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--> $DIR/promote-not.rs:89:26
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LL | let x: &'static _ = &UnionWithCell { f1: 0 };
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| ---------- ^^^^^^^^^^^^^^^^^^^^^^^ creates a temporary value which is freed while still in use
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@ -265,6 +274,7 @@ LL |
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LL | }
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| - temporary value is freed at the end of this statement
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error: aborting due to 25 previous errors
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error: aborting due to 26 previous errors
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For more information about this error, try `rustc --explain E0716`.
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Some errors have detailed explanations: E0493, E0716.
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For more information about an error, try `rustc --explain E0493`.
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