Enable ConstPropLint for promoteds

This fixes the issue wherein the lint didn't fire for promoteds in the case of SHL/SHR operators in non-optimized builds and all arithmetic operators in optimized builds
rust-lang · Dec 31, 2023 · c1f91b7 · c1f91b7
1 parent dfb1f5e
commit c1f91b7
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Showing 17 changed files with 5,697 additions and 23 deletions.
diff --git a/compiler/rustc_mir_transform/src/const_prop_lint.rs b/compiler/rustc_mir_transform/src/const_prop_lint.rs
@@ -42,11 +42,6 @@ impl<'tcx> MirLint<'tcx> for ConstPropLint {
             return;
         }
 
-        // will be evaluated by miri and produce its errors there
-        if body.source.promoted.is_some() {
-            return;
-        }
-
         let def_id = body.source.def_id().expect_local();
         let def_kind = tcx.def_kind(def_id);
         let is_fn_like = def_kind.is_fn_like();

diff --git a/src/tools/miri/tests/pass/overflow_checks_off.rs b/src/tools/miri/tests/pass/overflow_checks_off.rs
@@ -1,12 +1,17 @@
 //@compile-flags: -C overflow-checks=off
 
 // Check that we correctly implement the intended behavior of these operators
-// when they are not being overflow-checked.
+// when they are not being overflow-checked at runtime.
 
 // FIXME: if we call the functions in `std::ops`, we still get the panics.
 // Miri does not implement the codegen-time hack that backs `#[rustc_inherit_overflow_checks]`.
 // use std::ops::*;
 
+
+// Disable _compile-time_ overflow linting
+// so that we can test runtime overflow checks
+ #![allow(arithmetic_overflow)]
+
 fn main() {
     assert_eq!(-{ -0x80i8 }, -0x80);
 

diff --git a/tests/ui/associated-consts/defaults-cyclic-fail.stderr b/tests/ui/associated-consts/defaults-cyclic-fail.stderr
@@ -20,11 +20,11 @@ note: ...which requires const-evaluating + checking `Tr::B`...
 LL |     const B: u8 = Self::A;
    |                   ^^^^^^^
    = note: ...which again requires simplifying constant for the type system `Tr::A`, completing the cycle
-note: cycle used when const-evaluating + checking `main::promoted[1]`
-  --> $DIR/defaults-cyclic-fail.rs:16:16
+note: cycle used when simplifying constant for the type system `Tr::A`
+  --> $DIR/defaults-cyclic-fail.rs:5:5
    |
-LL |     assert_eq!(<() as Tr>::A, 0);
-   |                ^^^^^^^^^^^^^
+LL |     const A: u8 = Self::B;
+   |     ^^^^^^^^^^^
    = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
 
 error: aborting due to 1 previous error

diff --git a/tests/ui/associated-consts/defaults-not-assumed-fail.stderr b/tests/ui/associated-consts/defaults-not-assumed-fail.stderr
@@ -10,6 +10,14 @@ note: erroneous constant encountered
 LL |     assert_eq!(<() as Tr>::B, 0);    // causes the error above
    |                ^^^^^^^^^^^^^
 
+note: erroneous constant encountered
+  --> $DIR/defaults-not-assumed-fail.rs:33:16
+   |
+LL |     assert_eq!(<() as Tr>::B, 0);    // causes the error above
+   |                ^^^^^^^^^^^^^
+   |
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+
 note: erroneous constant encountered
   --> $DIR/defaults-not-assumed-fail.rs:33:5
    |

diff --git a/tests/ui/consts/const-eval/issue-44578.stderr b/tests/ui/consts/const-eval/issue-44578.stderr
@@ -10,6 +10,14 @@ note: erroneous constant encountered
 LL |     println!("{}", <Bar<u16, u8> as Foo>::AMT);
    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^
 
+note: erroneous constant encountered
+  --> $DIR/issue-44578.rs:25:20
+   |
+LL |     println!("{}", <Bar<u16, u8> as Foo>::AMT);
+   |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+
 note: erroneous constant encountered
   --> $DIR/issue-44578.rs:25:20
    |

diff --git a/tests/ui/consts/const-eval/issue-50814.rs b/tests/ui/consts/const-eval/issue-50814.rs
@@ -14,6 +14,7 @@ struct Sum<A, B>(A, B);
 impl<A: Unsigned, B: Unsigned> Unsigned for Sum<A, B> {
     const MAX: u8 = A::MAX + B::MAX;
     //~^ ERROR evaluation of `<Sum<U8, U8> as Unsigned>::MAX` failed
+    //~| ERROR evaluation of `<Sum<U8, U8> as Unsigned>::MAX` failed
 }
 
 fn foo<T>(_: T) -> &'static u8 {

diff --git a/tests/ui/consts/const-eval/issue-50814.stderr b/tests/ui/consts/const-eval/issue-50814.stderr
@@ -5,17 +5,33 @@ LL |     const MAX: u8 = A::MAX + B::MAX;
    |                     ^^^^^^^^^^^^^^^ attempt to compute `u8::MAX + u8::MAX`, which would overflow
 
 note: erroneous constant encountered
-  --> $DIR/issue-50814.rs:20:6
+  --> $DIR/issue-50814.rs:21:6
    |
 LL |     &Sum::<U8, U8>::MAX
    |      ^^^^^^^^^^^^^^^^^^
 
+error[E0080]: evaluation of `<Sum<U8, U8> as Unsigned>::MAX` failed
+  --> $DIR/issue-50814.rs:15:21
+   |
+LL |     const MAX: u8 = A::MAX + B::MAX;
+   |                     ^^^^^^^^^^^^^^^ attempt to compute `u8::MAX + u8::MAX`, which would overflow
+   |
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+
+note: erroneous constant encountered
+  --> $DIR/issue-50814.rs:21:6
+   |
+LL |     &Sum::<U8, U8>::MAX
+   |      ^^^^^^^^^^^^^^^^^^
+   |
+   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
+
 note: the above error was encountered while instantiating `fn foo::<i32>`
-  --> $DIR/issue-50814.rs:25:5
+  --> $DIR/issue-50814.rs:26:5
    |
 LL |     foo(0);
    |     ^^^^^^
 
-error: aborting due to 1 previous error
+error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0080`.
diff --git a/tests/ui/consts/promotion.rs b/tests/ui/consts/promotion.rs
@@ -25,9 +25,8 @@ fn main() {
     assert_static(&["d", "e", "f"]);
     assert_eq!(C, 42);
 
-    // make sure that these do not cause trouble despite overflowing
+    // make sure that this does not cause trouble despite overflowing
     assert_static(&(0-1));
-    assert_static(&-i32::MIN);
 
     // div-by-non-0 is okay
     assert_static(&(1/1));