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Rollup merge of #84903 - hyd-dev:dead-check-in-alloc-msg, r=RalfJung

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Remove `rustc_middle::mir::interpret::CheckInAllocMsg::NullPointerTest`

Removing it per https://github.com/rust-lang/rust/pull/84842#discussion_r625589674: it's a dead enum variant.

Note that `PointerArithmeticTest` also seems dead:
```
$ rg -F PointerArithmeticTest -C5
compiler/rustc_middle/src/mir/interpret/error.rs
169-
170-/// Details of why a pointer had to be in-bounds.
171-#[derive(Debug, Copy, Clone, TyEncodable, TyDecodable, HashStable)]
172-pub enum CheckInAllocMsg {
173-    MemoryAccessTest,
174:    PointerArithmeticTest,
175-    InboundsTest,
176-}
177-
178-impl fmt::Display for CheckInAllocMsg {
179-    /// When this is printed as an error the context looks like this
--
182-        write!(
183-            f,
184-            "{}",
185-            match *self {
186-                CheckInAllocMsg::MemoryAccessTest => "memory access",
187:                CheckInAllocMsg::PointerArithmeticTest => "pointer arithmetic",
188-                CheckInAllocMsg::InboundsTest => "inbounds test",
189-            }
190-        )
191-    }
192-}
```
Not sure if that is also desirable to be removed, however.
This commit is contained in:
Ralf Jung 2021-05-05 17:52:28 +02:00 • committed by GitHub
commit 2c7bf41b97
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compiler/rustc_middle/src/mir/interpret/error.rs
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@ -171,7 +171,6 @@ impl fmt::Display for InvalidProgramInfo<'_> {
#[derive(Debug, Copy, Clone, TyEncodable, TyDecodable, HashStable)]
pub enum CheckInAllocMsg {
MemoryAccessTest,
NullPointerTest,
PointerArithmeticTest,
InboundsTest,
}
@ -185,7 +184,6 @@ impl fmt::Display for CheckInAllocMsg {
"{}",
match *self {
CheckInAllocMsg::MemoryAccessTest => "memory access",
CheckInAllocMsg::NullPointerTest => "null pointer test",
CheckInAllocMsg::PointerArithmeticTest => "pointer arithmetic",
CheckInAllocMsg::InboundsTest => "inbounds test",
}
@ -308,9 +306,6 @@ impl fmt::Display for UndefinedBehaviorInfo<'_> {
ptr.alloc_id,
allocation_size.bytes()
),
DanglingIntPointer(_, CheckInAllocMsg::NullPointerTest) => {
write!(f, "null pointer is not allowed for this operation")
}
DanglingIntPointer(i, msg) => {
write!(f, "{} failed: 0x{:x} is not a valid pointer", msg, i)
}