Closed
Description
Error
error[E0493]: destructors cannot be evaluated at compile-time
--> cargo/azul-core/../../azul-core/dom.rs:895:69
|
895 | pub const fn set_node_type(&mut self, node_type: NodeType<T>) { self.node_type = node_type; }
| ^^^^^^^^^^^^^^ constant functions cannot evaluate destructors
error[E0019]: constant function contains unimplemented expression type
--> cargo/azul-core/../../azul-core/dom.rs:895:69
|
895 | pub const fn set_node_type(&mut self, node_type: NodeType<T>) { self.node_type = node_type; }
| ^^^^^^^^^^^^^^
[ERROR rustc_mir::transform::qualify_consts] old validator: [(cargo/azul-core/../../azul-core/dom.rs:895:69: 895:83, "LiveDrop"), (cargo/azul-core/../../azul-core/dom.rs:895:69: 895:83, "MutDeref")]
[ERROR rustc_mir::transform::qualify_consts] new validator: [(cargo/azul-core/../../azul-core/dom.rs:895:69: 895:83, "MutDeref"), (cargo/azul-core/../../azul-core/dom.rs:895:69: 895:83, "LiveDrop")]
error: internal compiler error: src/librustc_mir/transform/qualify_consts.rs:1986: Disagreement between legacy and dataflow-based const validators.
After filing an issue, use `-Zsuppress-const-validation-back-compat-ice` to compile your code.
--> cargo/azul-core/../../azul-core/dom.rs:895:5
|
895 | pub const fn set_node_type(&mut self, node_type: NodeType<T>) { self.node_type = node_type; }
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Backtrace
thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:890:9
stack backtrace:
0: backtrace::backtrace::libunwind::trace
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/libunwind.rs:88
1: backtrace::backtrace::trace_unsynchronized
at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.40/src/backtrace/mod.rs:66
2: std::sys_common::backtrace::_print_fmt
at src/libstd/sys_common/backtrace.rs:77
3: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
at src/libstd/sys_common/backtrace.rs:61
4: core::fmt::write
at src/libcore/fmt/mod.rs:1028
5: std::io::Write::write_fmt
at src/libstd/io/mod.rs:1412
6: std::sys_common::backtrace::_print
at src/libstd/sys_common/backtrace.rs:65
7: std::sys_common::backtrace::print
at src/libstd/sys_common/backtrace.rs:50
8: std::panicking::default_hook::{{closure}}
at src/libstd/panicking.rs:188
9: std::panicking::default_hook
at src/libstd/panicking.rs:205
10: rustc_driver::report_ice
11: std::panicking::rust_panic_with_hook
at src/libstd/panicking.rs:468
12: std::panicking::begin_panic
13: rustc_errors::HandlerInner::span_bug
14: rustc_errors::Handler::span_bug
15: rustc::util::bug::opt_span_bug_fmt::{{closure}}
16: rustc::ty::context::tls::with_opt::{{closure}}
17: rustc::ty::context::tls::with_context_opt
18: rustc::ty::context::tls::with_opt
19: rustc::util::bug::opt_span_bug_fmt
20: rustc::util::bug::span_bug_fmt
21: rustc_mir::transform::qualify_consts::Checker::check_const
22: <rustc_mir::transform::qualify_consts::QualifyAndPromoteConstants as rustc_mir::transform::MirPass>::run_pass
23: rustc_mir::transform::run_passes
24: rustc_mir::transform::mir_validated
25: rustc::ty::query::__query_compute::mir_validated
26: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::mir_validated>::compute
27: rustc::dep_graph::graph::DepGraph::with_task_impl
28: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
29: rustc_mir::borrow_check::mir_borrowck
30: rustc::ty::query::__query_compute::mir_borrowck
31: rustc::ty::query::<impl rustc::ty::query::config::QueryAccessors for rustc::ty::query::queries::mir_borrowck>::compute
32: rustc::dep_graph::graph::DepGraph::with_task_impl
33: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
34: rustc::ty::<impl rustc::ty::context::TyCtxt>::par_body_owners
35: rustc_interface::passes::analysis
36: rustc::ty::query::__query_compute::analysis
37: rustc::dep_graph::graph::DepGraph::with_task_impl
38: rustc::ty::query::plumbing::<impl rustc::ty::context::TyCtxt>::get_query
39: rustc_interface::passes::BoxedGlobalCtxt::access::{{closure}}
40: rustc_interface::passes::create_global_ctxt::{{closure}}
41: rustc_interface::passes::BoxedGlobalCtxt::enter
42: rustc_interface::interface::run_compiler_in_existing_thread_pool
43: std::thread::local::LocalKey<T>::with
44: scoped_tls::ScopedKey<T>::set
45: syntax::with_globals
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports
note: rustc 1.40.0-nightly (1423bec54 2019-11-05) running on x86_64-unknown-linux-gnu
note: compiler flags: -C debuginfo=2 -C incremental --crate-type rlib --crate-type cdylib
note: some of the compiler flags provided by cargo are hidden
query stack during panic:
#0 [mir_validated] processing `dom::NodeData::<T>::set_node_type`
#1 [mir_borrowck] processing `dom::NodeData::<T>::set_node_type`
#2 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to 3 previous errors
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports
note: rustc 1.40.0-nightly (1423bec54 2019-11-05) running on x86_64-unknown-linux-gnu
note: compiler flags: -C debuginfo=2 -C incremental --crate-type rlib --crate-type cdylib
note: some of the compiler flags provided by cargo are hidden
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0019, E0493.
For more information about an error, try `rustc --explain E0019`.
error: could not compile `azul-core`.
warning: build failed, waiting for other jobs to finish...
error: build failed
Code
https://github.com/maps4print/azul/tree/rust-const-ice
Commit fschutt/azul@b38fb1b
Changed here: fschutt/azul@b38fb1b#diff-ce9aead5dc9a44d99879f251fc571013R897
Reproducing the bug
rustup update
git clone https://github.com/maps4print/azul
git checkout rust-const-ice
cargo check
Description
I was trying to turn a couple of functions that take a &mut self
into const fns - which should technically work:
struct Dom { a: usize }
impl Dom {
const fn do_thing(&mut self, a: usize) { self.a = a; }
}
As far as I can see, only the ordering of liveness-checking is wrong, the old liveness checker reports ["LiveDrop", "MutDeref"]
while the new liveness checker reports ["MutDeref", "LiveDrop"]
. Should be an easy (?) bug to fix (famous last words).
Rust version:
rustc 1.40.0-nightly (1423bec54 2019-11-05)
binary: rustc
commit-hash: 1423bec54cf2db283b614e527cfd602b481485d1
commit-date: 2019-11-05
host: x86_64-unknown-linux-gnu
release: 1.40.0-nightly
LLVM version: 9.0