diff options
Diffstat (limited to 'tests/ui/lint/dead-code')
-rw-r--r-- | tests/ui/lint/dead-code/closure-bang.rs | 4 | ||||
-rw-r--r-- | tests/ui/lint/dead-code/closure-bang.stderr | 17 | ||||
-rw-r--r-- | tests/ui/lint/dead-code/offset-of-correct-param-env.rs | 42 | ||||
-rw-r--r-- | tests/ui/lint/dead-code/offset-of.rs | 44 | ||||
-rw-r--r-- | tests/ui/lint/dead-code/offset-of.stderr | 50 |
5 files changed, 154 insertions, 3 deletions
diff --git a/tests/ui/lint/dead-code/closure-bang.rs b/tests/ui/lint/dead-code/closure-bang.rs index 8e8636b11..bca131a15 100644 --- a/tests/ui/lint/dead-code/closure-bang.rs +++ b/tests/ui/lint/dead-code/closure-bang.rs @@ -1,9 +1,7 @@ -// ignore-test FIXME(#20574) - #![deny(unreachable_code)] fn main() { - let x = || panic!(); + let x = || -> ! { panic!() }; x(); println!("Foo bar"); //~ ERROR: unreachable statement } diff --git a/tests/ui/lint/dead-code/closure-bang.stderr b/tests/ui/lint/dead-code/closure-bang.stderr new file mode 100644 index 000000000..119ce11e3 --- /dev/null +++ b/tests/ui/lint/dead-code/closure-bang.stderr @@ -0,0 +1,17 @@ +error: unreachable statement + --> $DIR/closure-bang.rs:6:5 + | +LL | x(); + | --- any code following this expression is unreachable +LL | println!("Foo bar"); + | ^^^^^^^^^^^^^^^^^^^ unreachable statement + | +note: the lint level is defined here + --> $DIR/closure-bang.rs:1:9 + | +LL | #![deny(unreachable_code)] + | ^^^^^^^^^^^^^^^^ + = note: this error originates in the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info) + +error: aborting due to previous error + diff --git a/tests/ui/lint/dead-code/offset-of-correct-param-env.rs b/tests/ui/lint/dead-code/offset-of-correct-param-env.rs new file mode 100644 index 000000000..2c6fcef25 --- /dev/null +++ b/tests/ui/lint/dead-code/offset-of-correct-param-env.rs @@ -0,0 +1,42 @@ +// check-pass + +#![feature(offset_of)] +#![deny(dead_code)] + +// This struct contains a projection that can only be normalized after getting the field type. +struct A<T: Project> { + a: <T as Project>::EquateParamTo, +} + +// This is the inner struct that we want to get. +struct MyFieldIsNotDead { + not_dead: u8, +} + +// These are some helpers. +// Inside the param env of `test`, we want to make it so that it considers T=MyFieldIsNotDead. +struct GenericIsEqual<T>(T); +trait Project { + type EquateParamTo; +} +impl<T> Project for GenericIsEqual<T> { + type EquateParamTo = T; +} + +fn test<T>() -> usize +where + GenericIsEqual<T>: Project<EquateParamTo = MyFieldIsNotDead>, +{ + // The first field of the A that we construct here is + // `<GenericIsEqual<T>> as Project>::EquateParamTo`. + // Typeck normalizes this and figures that the not_dead field is totally fine and accessible. + // But importantly, the normalization ends up with T, which, as we've declared in our param + // env is MyFieldDead. When we're in the param env of the `a` field, the where bound above + // is not in scope, so we don't know what T is - it's generic. + // If we use the wrong param env, the lint will ICE. + std::mem::offset_of!(A<GenericIsEqual<T>>, a.not_dead) +} + +fn main() { + test::<MyFieldIsNotDead>(); +} diff --git a/tests/ui/lint/dead-code/offset-of.rs b/tests/ui/lint/dead-code/offset-of.rs new file mode 100644 index 000000000..da91de386 --- /dev/null +++ b/tests/ui/lint/dead-code/offset-of.rs @@ -0,0 +1,44 @@ +#![feature(offset_of)] +#![deny(dead_code)] + +use std::mem::offset_of; + +struct Alpha { + a: (), + b: (), //~ ERROR field `b` is never read + c: Beta, +} + +struct Beta { + a: (), //~ ERROR field `a` is never read + b: (), +} + +struct Gamma { + a: (), //~ ERROR field `a` is never read + b: (), +} + +struct Delta { + a: (), + b: (), //~ ERROR field `b` is never read +} + +trait Trait { + type Assoc; +} +impl Trait for () { + type Assoc = Delta; +} + +struct Project<T: Trait> { + a: u8, //~ ERROR field `a` is never read + b: <T as Trait>::Assoc, +} + +fn main() { + offset_of!(Alpha, a); + offset_of!(Alpha, c.b); + offset_of!((Gamma,), 0.b); + offset_of!(Project::<()>, b.a); +} diff --git a/tests/ui/lint/dead-code/offset-of.stderr b/tests/ui/lint/dead-code/offset-of.stderr new file mode 100644 index 000000000..ed2916461 --- /dev/null +++ b/tests/ui/lint/dead-code/offset-of.stderr @@ -0,0 +1,50 @@ +error: field `b` is never read + --> $DIR/offset-of.rs:8:5 + | +LL | struct Alpha { + | ----- field in this struct +LL | a: (), +LL | b: (), + | ^ + | +note: the lint level is defined here + --> $DIR/offset-of.rs:2:9 + | +LL | #![deny(dead_code)] + | ^^^^^^^^^ + +error: field `a` is never read + --> $DIR/offset-of.rs:13:5 + | +LL | struct Beta { + | ---- field in this struct +LL | a: (), + | ^ + +error: field `a` is never read + --> $DIR/offset-of.rs:18:5 + | +LL | struct Gamma { + | ----- field in this struct +LL | a: (), + | ^ + +error: field `b` is never read + --> $DIR/offset-of.rs:24:5 + | +LL | struct Delta { + | ----- field in this struct +LL | a: (), +LL | b: (), + | ^ + +error: field `a` is never read + --> $DIR/offset-of.rs:35:5 + | +LL | struct Project<T: Trait> { + | ------- field in this struct +LL | a: u8, + | ^ + +error: aborting due to 5 previous errors + |