remove some unused CTFE error variants

Author: RalfJung

src/librustc/ich/impls_ty.rs

@@ -597,48 +597,6 @@ for ::mir::interpret::EvalErrorKind<'gcx, O> {
                 required.hash_stable(hcx, hasher);
                 has.hash_stable(hcx, hasher)
             },
-            MemoryLockViolation {
-                ptr,
-                len,
-                frame,
-                access,
-                ref lock,
-            } =>  {
-                ptr.hash_stable(hcx, hasher);
-                len.hash_stable(hcx, hasher);
-                frame.hash_stable(hcx, hasher);
-                access.hash_stable(hcx, hasher);
-                lock.hash_stable(hcx, hasher)
-            },
-            MemoryAcquireConflict {
-                ptr,
-                len,
-                kind,
-                ref lock,
-            } =>  {
-                ptr.hash_stable(hcx, hasher);
-                len.hash_stable(hcx, hasher);
-                kind.hash_stable(hcx, hasher);
-                lock.hash_stable(hcx, hasher)
-            },
-            InvalidMemoryLockRelease {
-                ptr,
-                len,
-                frame,
-                ref lock,
-            } =>  {
-                ptr.hash_stable(hcx, hasher);
-                len.hash_stable(hcx, hasher);
-                frame.hash_stable(hcx, hasher);
-                lock.hash_stable(hcx, hasher)
-            },
-            DeallocatedLockedMemory {
-                ptr,
-                ref lock,
-            } => {
-                ptr.hash_stable(hcx, hasher);
-                lock.hash_stable(hcx, hasher)
-            },
             ValidationFailure(ref s) => s.hash_stable(hcx, hasher),
             TypeNotPrimitive(ty) => ty.hash_stable(hcx, hasher),
             ReallocatedWrongMemoryKind(ref a, ref b) => {

src/librustc/mir/interpret/error.rs

@@ -15,9 +15,7 @@ use ty::{Ty, layout};
 use ty::layout::{Size, Align, LayoutError};
 use rustc_target::spec::abi::Abi;
 
-use super::{
-    Pointer, Lock, AccessKind
-};
+use super::Pointer;
 
 use backtrace::Backtrace;
 
@@ -274,29 +272,6 @@ pub enum EvalErrorKind<'tcx, O> {
         required: Align,
         has: Align,
     },
-    MemoryLockViolation {
-        ptr: Pointer,
-        len: u64,
-        frame: usize,
-        access: AccessKind,
-        lock: Lock,
-    },
-    MemoryAcquireConflict {
-        ptr: Pointer,
-        len: u64,
-        kind: AccessKind,
-        lock: Lock,
-    },
-    InvalidMemoryLockRelease {
-        ptr: Pointer,
-        len: u64,
-        frame: usize,
-        lock: Lock,
-    },
-    DeallocatedLockedMemory {
-        ptr: Pointer,
-        lock: Lock,
-    },
     ValidationFailure(String),
     CalledClosureAsFunction,
     VtableForArgumentlessMethod,
@@ -360,16 +335,8 @@ impl<'tcx, O> EvalErrorKind<'tcx, O> {
                 "pointer offset outside bounds of allocation",
             InvalidNullPointerUsage =>
                 "invalid use of NULL pointer",
-            MemoryLockViolation { .. } =>
-                "memory access conflicts with lock",
-            MemoryAcquireConflict { .. } =>
-                "new memory lock conflicts with existing lock",
             ValidationFailure(..) =>
                 "type validation failed",
-            InvalidMemoryLockRelease { .. } =>
-                "invalid attempt to release write lock",
-            DeallocatedLockedMemory { .. } =>
-                "tried to deallocate memory in conflict with a lock",
             ReadPointerAsBytes =>
                 "a raw memory access tried to access part of a pointer value as raw bytes",
             ReadBytesAsPointer =>
@@ -495,22 +462,6 @@ impl<'tcx, O: fmt::Debug> fmt::Debug for EvalErrorKind<'tcx, O> {
                        if access { "memory access" } else { "pointer computed" },
                        ptr.offset.bytes(), ptr.alloc_id, allocation_size.bytes())
             },
-            MemoryLockViolation { ptr, len, frame, access, ref lock } => {
-                write!(f, "{:?} access by frame {} at {:?}, size {}, is in conflict with lock {:?}",
-                       access, frame, ptr, len, lock)
-            }
-            MemoryAcquireConflict { ptr, len, kind, ref lock } => {
-                write!(f, "new {:?} lock at {:?}, size {}, is in conflict with lock {:?}",
-                       kind, ptr, len, lock)
-            }
-            InvalidMemoryLockRelease { ptr, len, frame, ref lock } => {
-                write!(f, "frame {} tried to release memory write lock at {:?}, size {}, but \
-                       cannot release lock {:?}", frame, ptr, len, lock)
-            }
-            DeallocatedLockedMemory { ptr, ref lock } => {
-                write!(f, "tried to deallocate memory at {:?} in conflict with lock {:?}",
-                       ptr, lock)
-            }
             ValidationFailure(ref err) => {
                 write!(f, "type validation failed: {}", err)
             }

src/librustc_mir/transform/const_prop.rs

@@ -183,11 +183,7 @@ impl<'a, 'mir, 'tcx> ConstPropagator<'a, 'mir, 'tcx> {
                     | InvalidDiscriminant(..)
                     | PointerOutOfBounds { .. }
                     | InvalidNullPointerUsage
-                    | MemoryLockViolation { .. }
-                    | MemoryAcquireConflict { .. }
                     | ValidationFailure(..)
-                    | InvalidMemoryLockRelease { .. }
-                    | DeallocatedLockedMemory { .. }
                     | InvalidPointerMath
                     | ReadUndefBytes(_)
                     | DeadLocal