Rollup merge of #71420 - RalfJung:specialization-incomplete, r=matthewjasper

Specialization is unsound

As discussed in #31844 (comment), it might be a good idea to warn users of specialization that the feature they are using is unsound.

I also expanded the "incomplete feature" warning to link the user to the tracking issue.

Author: Manishearth

src/libcore/tests/lib.rs

@@ -19,7 +19,7 @@
 #![feature(raw)]
 #![feature(sort_internals)]
 #![feature(slice_partition_at_index)]
-#![feature(specialization)]
+#![feature(min_specialization)]
 #![feature(step_trait)]
 #![feature(step_trait_ext)]
 #![feature(str_internals)]

src/librustc_feature/active.rs

@@ -596,4 +596,5 @@ pub const INCOMPLETE_FEATURES: &[Symbol] = &[
     sym::raw_dylib,
     sym::const_trait_impl,
     sym::const_trait_bound_opt_out,
+    sym::specialization,
 ];

src/test/compile-fail/specialization/issue-50452.rs

@@ -1,6 +1,6 @@
 // compile-fail
-
 #![feature(specialization)]
+//~^ WARN the feature `specialization` is incomplete
 
 pub trait Foo {
     fn foo();

src/test/ui/associated-types/defaults-specialization.rs

@@ -1,6 +1,7 @@
 //! Tests the interaction of associated type defaults and specialization.
 
 #![feature(associated_type_defaults, specialization)]
+//~^ WARN the feature `specialization` is incomplete
 
 trait Tr {
     type Ty = u8;

src/test/ui/associated-types/defaults-specialization.stderr

@@ -1,5 +1,14 @@
+warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/defaults-specialization.rs:3:38
+   |
+LL | #![feature(associated_type_defaults, specialization)]
+   |                                      ^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
+
 error[E0053]: method `make` has an incompatible type for trait
-  --> $DIR/defaults-specialization.rs:18:18
+  --> $DIR/defaults-specialization.rs:19:18
    |
 LL |     fn make() -> Self::Ty {
    |                  -------- type in trait
@@ -11,7 +20,7 @@ LL |     fn make() -> u8 { 0 }
               found fn pointer `fn() -> u8`
 
 error[E0053]: method `make` has an incompatible type for trait
-  --> $DIR/defaults-specialization.rs:34:18
+  --> $DIR/defaults-specialization.rs:35:18
    |
 LL |     fn make() -> Self::Ty {
    |                  -------- type in trait
@@ -26,7 +35,7 @@ LL |     fn make() -> bool { true }
               found fn pointer `fn() -> bool`
 
 error[E0308]: mismatched types
-  --> $DIR/defaults-specialization.rs:9:9
+  --> $DIR/defaults-specialization.rs:10:9
    |
 LL |     type Ty = u8;
    |     ------------- associated type defaults can't be assumed inside the trait defining them
@@ -40,7 +49,7 @@ LL |         0u8
                          found type `u8`
 
 error[E0308]: mismatched types
-  --> $DIR/defaults-specialization.rs:25:29
+  --> $DIR/defaults-specialization.rs:26:29
    |
 LL |     fn make() -> Self::Ty { 0u8 }
    |                  --------   ^^^ expected associated type, found `u8`
@@ -53,7 +62,7 @@ LL |     fn make() -> Self::Ty { 0u8 }
    = note: for more information, visit https://doc.rust-lang.org/book/ch19-03-advanced-traits.html
 
 error[E0308]: mismatched types
-  --> $DIR/defaults-specialization.rs:43:29
+  --> $DIR/defaults-specialization.rs:44:29
    |
 LL |     default type Ty = bool;
    |     ----------------------- expected this associated type
@@ -67,7 +76,7 @@ LL |     fn make() -> Self::Ty { true }
                          found type `bool`
 
 error[E0308]: mismatched types
-  --> $DIR/defaults-specialization.rs:86:32
+  --> $DIR/defaults-specialization.rs:87:32
    |
 LL |     let _: <B<()> as Tr>::Ty = 0u8;
    |            -----------------   ^^^ expected associated type, found `u8`
@@ -77,13 +86,13 @@ LL |     let _: <B<()> as Tr>::Ty = 0u8;
    = note: expected associated type `<B<()> as Tr>::Ty`
                          found type `u8`
 help: a method is available that returns `<B<()> as Tr>::Ty`
-  --> $DIR/defaults-specialization.rs:8:5
+  --> $DIR/defaults-specialization.rs:9:5
    |
 LL |     fn make() -> Self::Ty {
    |     ^^^^^^^^^^^^^^^^^^^^^ consider calling `Tr::make`
 
 error[E0308]: mismatched types
-  --> $DIR/defaults-specialization.rs:87:32
+  --> $DIR/defaults-specialization.rs:88:32
    |
 LL |     let _: <B<()> as Tr>::Ty = true;
    |            -----------------   ^^^^ expected associated type, found `bool`
@@ -93,13 +102,13 @@ LL |     let _: <B<()> as Tr>::Ty = true;
    = note: expected associated type `<B<()> as Tr>::Ty`
                          found type `bool`
 help: a method is available that returns `<B<()> as Tr>::Ty`
-  --> $DIR/defaults-specialization.rs:8:5
+  --> $DIR/defaults-specialization.rs:9:5
    |
 LL |     fn make() -> Self::Ty {
    |     ^^^^^^^^^^^^^^^^^^^^^ consider calling `Tr::make`
 
 error[E0308]: mismatched types
-  --> $DIR/defaults-specialization.rs:88:33
+  --> $DIR/defaults-specialization.rs:89:33
    |
 LL |     let _: <B2<()> as Tr>::Ty = 0u8;
    |            ------------------   ^^^ expected associated type, found `u8`
@@ -109,13 +118,13 @@ LL |     let _: <B2<()> as Tr>::Ty = 0u8;
    = note: expected associated type `<B2<()> as Tr>::Ty`
                          found type `u8`
 help: a method is available that returns `<B2<()> as Tr>::Ty`
-  --> $DIR/defaults-specialization.rs:8:5
+  --> $DIR/defaults-specialization.rs:9:5
    |
 LL |     fn make() -> Self::Ty {
    |     ^^^^^^^^^^^^^^^^^^^^^ consider calling `Tr::make`
 
 error[E0308]: mismatched types
-  --> $DIR/defaults-specialization.rs:89:33
+  --> $DIR/defaults-specialization.rs:90:33
    |
 LL |     let _: <B2<()> as Tr>::Ty = true;
    |            ------------------   ^^^^ expected associated type, found `bool`
@@ -125,12 +134,12 @@ LL |     let _: <B2<()> as Tr>::Ty = true;
    = note: expected associated type `<B2<()> as Tr>::Ty`
                          found type `bool`
 help: a method is available that returns `<B2<()> as Tr>::Ty`
-  --> $DIR/defaults-specialization.rs:8:5
+  --> $DIR/defaults-specialization.rs:9:5
    |
 LL |     fn make() -> Self::Ty {
    |     ^^^^^^^^^^^^^^^^^^^^^ consider calling `Tr::make`
 
-error: aborting due to 9 previous errors
+error: aborting due to 9 previous errors; 1 warning emitted
 
 Some errors have detailed explanations: E0053, E0308.
 For more information about an error, try `rustc --explain E0053`.

src/test/ui/coherence/coherence-inherited-assoc-ty-cycle-err.rs

@@ -4,6 +4,7 @@
 //
 // No we expect to run into a more user-friendly cycle error instead.
 #![feature(specialization)]
+//~^ WARN the feature `specialization` is incomplete
 
 trait Trait<T> { type Assoc; }
 //~^ ERROR E0391

src/test/ui/coherence/coherence-inherited-assoc-ty-cycle-err.stderr

@@ -1,16 +1,25 @@
+warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/coherence-inherited-assoc-ty-cycle-err.rs:6:12
+   |
+LL | #![feature(specialization)]
+   |            ^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
+
 error[E0391]: cycle detected when building specialization graph of trait `Trait`
-  --> $DIR/coherence-inherited-assoc-ty-cycle-err.rs:8:1
+  --> $DIR/coherence-inherited-assoc-ty-cycle-err.rs:9:1
    |
 LL | trait Trait<T> { type Assoc; }
    | ^^^^^^^^^^^^^^
    |
    = note: ...which again requires building specialization graph of trait `Trait`, completing the cycle
 note: cycle used when coherence checking all impls of trait `Trait`
-  --> $DIR/coherence-inherited-assoc-ty-cycle-err.rs:8:1
+  --> $DIR/coherence-inherited-assoc-ty-cycle-err.rs:9:1
    |
 LL | trait Trait<T> { type Assoc; }
    | ^^^^^^^^^^^^^^
 
-error: aborting due to previous error
+error: aborting due to previous error; 1 warning emitted
 
 For more information about this error, try `rustc --explain E0391`.

src/test/ui/consts/trait_specialization.rs

@@ -5,7 +5,7 @@
 // Tests that specialization does not cause optimizations running on polymorphic MIR to resolve
 // to a `default` implementation.
 
-#![feature(specialization)]
+#![feature(specialization)] //~ WARN the feature `specialization` is incomplete
 
 trait Marker {}
 

src/test/ui/consts/trait_specialization.stderr

@@ -0,0 +1,11 @@
+warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/trait_specialization.rs:8:12
+   |
+LL | #![feature(specialization)]
+   |            ^^^^^^^^^^^^^^
+   |
+   = note: `#[warn(incomplete_features)]` on by default
+   = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information
+
+warning: 1 warning emitted
+

src/test/ui/error-codes/E0520.rs

@@ -1,4 +1,5 @@
 #![feature(specialization)]
+//~^ WARN the feature `specialization` is incomplete
 
 trait SpaceLlama {
     fn fly(&self);