diff options
Diffstat (limited to 'src/test/ui/polymorphization/const_parameters')
4 files changed, 155 insertions, 0 deletions
diff --git a/src/test/ui/polymorphization/const_parameters/closures.rs b/src/test/ui/polymorphization/const_parameters/closures.rs new file mode 100644 index 00000000000..da83cc1bee4 --- /dev/null +++ b/src/test/ui/polymorphization/const_parameters/closures.rs @@ -0,0 +1,61 @@ +// build-fail +// compile-flags: -Zpolymorphize-errors +#![feature(const_generics)] +//~^ WARN the feature `const_generics` is incomplete + +// This test checks that the polymorphization analysis correctly detects unused const +// parameters in closures. + +// Function doesn't have any generic parameters to be unused. +pub fn no_parameters() { + let _ = || {}; +} + +// Function has an unused generic parameter in parent and closure. +pub fn unused<const T: usize>() -> usize { +//~^ ERROR item has unused generic parameters + let add_one = |x: usize| x + 1; +//~^ ERROR item has unused generic parameters + add_one(3) +} + +// Function has an unused generic parameter in closure, but not in parent. +pub fn used_parent<const T: usize>() -> usize { + let x: usize = T; + let add_one = |x: usize| x + 1; +//~^ ERROR item has unused generic parameters + x + add_one(3) +} + +// Function uses generic parameter in value of a binding in closure. +pub fn used_binding<const T: usize>() -> usize { + let x = || { + let y: usize = T; + y + }; + + x() +} + +// Closure uses a value as an upvar, which used the generic parameter. +pub fn unused_upvar<const T: usize>() -> usize { + let x: usize = T; + let y = || x; +//~^ ERROR item has unused generic parameters + y() +} + +// Closure uses generic parameter in substitutions to another function. +pub fn used_substs<const T: usize>() -> usize { + let x = || unused::<T>(); + x() +} + +fn main() { + no_parameters(); + let _ = unused::<1>(); + let _ = used_parent::<1>(); + let _ = used_binding::<1>(); + let _ = unused_upvar::<1>(); + let _ = used_substs::<1>(); +} diff --git a/src/test/ui/polymorphization/const_parameters/closures.stderr b/src/test/ui/polymorphization/const_parameters/closures.stderr new file mode 100644 index 00000000000..73a071f346a --- /dev/null +++ b/src/test/ui/polymorphization/const_parameters/closures.stderr @@ -0,0 +1,44 @@ +warning: the feature `const_generics` is incomplete and may not be safe to use and/or cause compiler crashes + --> $DIR/closures.rs:3:12 + | +LL | #![feature(const_generics)] + | ^^^^^^^^^^^^^^ + | + = note: `#[warn(incomplete_features)]` on by default + = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information + +error: item has unused generic parameters + --> $DIR/closures.rs:17:19 + | +LL | pub fn unused<const T: usize>() -> usize { + | - generic parameter `T` is unused +LL | +LL | let add_one = |x: usize| x + 1; + | ^^^^^^^^^^^^^^^^ + +error: item has unused generic parameters + --> $DIR/closures.rs:15:8 + | +LL | pub fn unused<const T: usize>() -> usize { + | ^^^^^^ - generic parameter `T` is unused + +error: item has unused generic parameters + --> $DIR/closures.rs:25:19 + | +LL | pub fn used_parent<const T: usize>() -> usize { + | - generic parameter `T` is unused +LL | let x: usize = T; +LL | let add_one = |x: usize| x + 1; + | ^^^^^^^^^^^^^^^^ + +error: item has unused generic parameters + --> $DIR/closures.rs:43:13 + | +LL | pub fn unused_upvar<const T: usize>() -> usize { + | - generic parameter `T` is unused +LL | let x: usize = T; +LL | let y = || x; + | ^^^^ + +error: aborting due to 4 previous errors; 1 warning emitted + diff --git a/src/test/ui/polymorphization/const_parameters/functions.rs b/src/test/ui/polymorphization/const_parameters/functions.rs new file mode 100644 index 00000000000..1c19f9480b4 --- /dev/null +++ b/src/test/ui/polymorphization/const_parameters/functions.rs @@ -0,0 +1,33 @@ +// build-fail +// compile-flags: -Zpolymorphize-errors +#![feature(const_generics)] +//~^ WARN the feature `const_generics` is incomplete + +// This test checks that the polymorphization analysis correctly detects unused const +// parameters in functions. + +// Function doesn't have any generic parameters to be unused. +pub fn no_parameters() {} + +// Function has an unused generic parameter. +pub fn unused<const T: usize>() { +//~^ ERROR item has unused generic parameters +} + +// Function uses generic parameter in value of a binding. +pub fn used_binding<const T: usize>() -> usize { + let x: usize = T; + x +} + +// Function uses generic parameter in substitutions to another function. +pub fn used_substs<const T: usize>() { + unused::<T>() +} + +fn main() { + no_parameters(); + unused::<1>(); + used_binding::<1>(); + used_substs::<1>(); +} diff --git a/src/test/ui/polymorphization/const_parameters/functions.stderr b/src/test/ui/polymorphization/const_parameters/functions.stderr new file mode 100644 index 00000000000..a503ec51942 --- /dev/null +++ b/src/test/ui/polymorphization/const_parameters/functions.stderr @@ -0,0 +1,17 @@ +warning: the feature `const_generics` is incomplete and may not be safe to use and/or cause compiler crashes + --> $DIR/functions.rs:3:12 + | +LL | #![feature(const_generics)] + | ^^^^^^^^^^^^^^ + | + = note: `#[warn(incomplete_features)]` on by default + = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information + +error: item has unused generic parameters + --> $DIR/functions.rs:13:8 + | +LL | pub fn unused<const T: usize>() { + | ^^^^^^ - generic parameter `T` is unused + +error: aborting due to previous error; 1 warning emitted + |