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Validate removal of AscribeUserType, FakeRead, and Shallow borrow #76548

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Merged
merged 1 commit into from
Sep 10, 2020
Merged

Validate removal of AscribeUserType, FakeRead, and Shallow borrow #76548

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28 changes: 26 additions & 2 deletions compiler/rustc_mir/src/transform/validate.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,8 +4,8 @@ use super::{MirPass, MirSource};
use rustc_middle::mir::visit::Visitor;
use rustc_middle::{
mir::{
AggregateKind, BasicBlock, Body, Location, MirPhase, Operand, Rvalue, Statement,
StatementKind, Terminator, TerminatorKind,
AggregateKind, BasicBlock, Body, BorrowKind, Location, MirPhase, Operand, Rvalue,
Statement, StatementKind, Terminator, TerminatorKind,
},
ty::{
self,
Expand Down Expand Up @@ -274,9 +274,33 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
)
}
}
Rvalue::Ref(_, BorrowKind::Shallow, _) => {
if self.mir_phase > MirPhase::DropLowering {
self.fail(
location,
"`Assign` statement with a `Shallow` borrow should have been removed after drop lowering phase",
);
}
}
_ => {}
}
}
StatementKind::AscribeUserType(..) => {
if self.mir_phase > MirPhase::DropLowering {
self.fail(
location,
"`AscribeUserType` should have been removed after drop lowering phase",
);
}
}
StatementKind::FakeRead(..) => {
if self.mir_phase > MirPhase::DropLowering {
self.fail(
location,
"`FakeRead` should have been removed after drop lowering phase",
);
}
}
_ => {}
}
}
Expand Down