BorrowError at Compile for Paths?

[Farmbot26]

I'm very confused. I have a ModelRc of structs that gets populated from an HTTP request. Each struct is meant to get a Path drawn in the UI.

This runs correctly:

for field[i] in select-map(map-combo.current-index).fields : Text {
text: field.commands;
}

This crashes on compile:

for field[i] in select-map(map-combo.current-index).fields : Path {
commands: field.commands;
stroke: green;
stroke-width: 1px;
}

with this error: thread 'main' panicked at 'already mutably borrowed: BorrowError'

Can anyone help?

[tronical]

That sounds like a bug. Could you please post a backtrace? (Maybe setting RUST_BACKTRACE=1 will help showing it)

[Farmbot26]

Full Stack Trace (with my name removed):

thread 'main' panicked at 'already mutably borrowed: BorrowError', /home/name/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-compiler-0.3.5/expression_tree.rs:571:22
stack backtrace:
0: 0x55c2336da9da - std::backtrace_rs::backtrace::libunwind::trace::h8f4e76b8218b8540
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
1: 0x55c2336da9da - std::backtrace_rs::backtrace::trace_unsynchronized::hcdb6a06d2fd94ab3
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: 0x55c2336da9da - std::sys_common::backtrace::_print_fmt::h6986e85b14c0a3c2
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/sys_common/backtrace.rs:65:5
3: 0x55c2336da9da - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hf09049473c7eb0d5
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/sys_common/backtrace.rs:44:22
4: 0x55c2336fd6ce - core::fmt::write::h7b08166a7a14a28e
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/core/src/fmt/mod.rs:1208:17
5: 0x55c2336d7755 - std::io::Write::write_fmt::hdb3e773b5b1c54df
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/io/mod.rs:1682:15
6: 0x55c2336da7a5 - std::sys_common::backtrace::_print::h1ceaebbb26a3fab3
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/sys_common/backtrace.rs:47:5
7: 0x55c2336da7a5 - std::sys_common::backtrace::print::hb5aa1269b1b9bc74
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/sys_common/backtrace.rs:34:9
8: 0x55c2336dbf8f - std::panicking::default_hook::{{closure}}::hbaa8ce6d79af00fb
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/panicking.rs:267:22
9: 0x55c2336dbccb - std::panicking::default_hook::hcd65d80b40db7fc0
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/panicking.rs:286:9
10: 0x55c2336dc69c - std::panicking::rust_panic_with_hook::hbb6ac4823ece4d03
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/panicking.rs:688:13
11: 0x55c2336dc439 - std::panicking::begin_panic_handler::{{closure}}::h325f7839ba4584c6
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/panicking.rs:579:13
12: 0x55c2336dae8c - std::sys_common::backtrace::__rust_end_short_backtrace::hacaef3341973bb56
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/sys_common/backtrace.rs:137:18
13: 0x55c2336dc142 - rust_begin_unwind
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/panicking.rs:575:5
14: 0x55c2328006a3 - core::panicking::panic_fmt::hef6845e1540bf16b
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/core/src/panicking.rs:64:14
15: 0x55c232800b33 - core::result::unwrap_failed::h1f98fd83f4600fae
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/core/src/result.rs:1791:5
16: 0x55c232d344be - core::result::Result<T,E>::expect::hd6d6e72c686689d0
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/core/src/result.rs:1070:23
17: 0x55c232bc9fc7 - core::cell::RefCell::borrow::h45ecbc94fb584d22
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/core/src/cell.rs:865:9
18: 0x55c232a8f2b0 - i_slint_compiler::expression_tree::Expression::ty::h34c23ecbbb5c2c7f
at /home/name/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-compiler-0.3.5/expression_tree.rs:568:56
19: 0x55c232a8dc5b - i_slint_compiler::expression_tree::Expression::ty::h34c23ecbbb5c2c7f
at /home/name/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-compiler-0.3.5/expression_tree.rs:586:67
20: 0x55c232ca92bf - i_slint_compiler::passes::compile_paths::compile_paths::{{closure}}::h403ffc01bb630f95
at /home/name/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-compiler-0.3.5/passes/compile_paths.rs:70:25
21: 0x55c232a287ff - i_slint_compiler::object_tree::recurse_elem::hcb1edd9ce94ac36a
at /home/name/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-compiler-0.3.5/object_tree.rs:1791:17
22: 0x55c232a28977 - i_slint_compiler::object_tree::recurse_elem::hcb1edd9ce94ac36a
at /home/name/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-compiler-0.3.5/object_tree.rs:1793:9
23: 0x55c232a28977 - i_slint_compiler::object_tree::recurse_elem::hcb1edd9ce94ac36a
at /home/name/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-compiler-0.3.5/object_tree.rs:1793:9
24: 0x55c232a28977 - i_slint_compiler::object_tree::recurse_elem::hcb1edd9ce94ac36a
at /home/name/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-compiler-0.3.5/object_tree.rs:1793:9
25: 0x55c232ca7f6d - i_slint_compiler::passes::compile_paths::compile_paths::h133739e0137095b2
at /home/name/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-compiler-0.3.5/passes/compile_paths.rs:28:5
26: 0x55c232819368 - i_slint_compiler::passes::run_passes::{{closure}}::h34fc1f852cd13790
at /home/name/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-compiler-0.3.5/passes.rs:85:9
27: 0x55c23283c117 - i_slint_compiler::compile_syntax_node::{{closure}}::hf1870a4d78356b8a
at /home/name/.cargo/registry/src/github.com-1ecc6299db9ec823/i-slint-compiler-0.3.5/lib.rs:181:82
28: 0x55c232838300 - spin_on::spin_on::hac5e530c3ca98287
at /home/name/.cargo/registry/src/github.com-1ecc6299db9ec823/spin_on-0.1.1/src/lib.rs:78:38
29: 0x55c232838e6b - slint_build::compile_with_config::heecd61188d18ecb0
at /home/name/.cargo/registry/src/github.com-1ecc6299db9ec823/slint-build-0.3.5/lib.rs:323:9
30: 0x55c23283a8bd - slint_build::compile::h6f6839dc748cb4db
at /home/name/.cargo/registry/src/github.com-1ecc6299db9ec823/slint-build-0.3.5/lib.rs:272:5
31: 0x55c232847ada - build_script_build::main::hb521439a8378dd4d
at /home/name/Desktop/drip_truck/build.rs:2:5
32: 0x55c23280732b - core::ops::function::FnOnce::call_once::hbaf360911fa3c70d
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/core/src/ops/function.rs:507:5
33: 0x55c232804e9e - std::sys_common::backtrace::__rust_begin_short_backtrace::hfa9a873f9bdd51b7
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/sys_common/backtrace.rs:121:18
34: 0x55c23283cc61 - std::rt::lang_start::{{closure}}::he917a268fa2aa351
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/rt.rs:166:18
35: 0x55c2336d246c - core::ops::function::impls::<impl core::ops::function::FnOnce for &F>::call_once::h2e730c3fa855d1cd
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/core/src/ops/function.rs:606:13
36: 0x55c2336d246c - std::panicking::try::do_call::h2452817705661d69
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/panicking.rs:483:40
37: 0x55c2336d246c - std::panicking::try::had9be61d7261a8f5
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/panicking.rs:447:19
38: 0x55c2336d246c - std::panic::catch_unwind::h0e0ee12d5e0e8c35
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/panic.rs:137:14
39: 0x55c2336d246c - std::rt::lang_start_internal::{{closure}}::hdfa1f1493a65dae1
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/rt.rs:148:48
40: 0x55c2336d246c - std::panicking::try::do_call::h5a2ac6628cbce239
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/panicking.rs:483:40
41: 0x55c2336d246c - std::panicking::try::h6b550c44d18ea4fc
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/panicking.rs:447:19
42: 0x55c2336d246c - std::panic::catch_unwind::hd574fc8a4fcd921a
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/panic.rs:137:14
43: 0x55c2336d246c - std::rt::lang_start_internal::h4189ab0091a05404
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/rt.rs:148:20
44: 0x55c23283cc3a - std::rt::lang_start::h0d49ca1dabfa098c
at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/rt.rs:165:17
45: 0x55c232847b0e - main
46: 0x7f19cfe20790 -
47: 0x7f19cfe2084a - __libc_start_main
48: 0x55c232800d15 - _start
49: 0x0 -

[tronical]

Thanks! I can reproduce that.

[tronical]

I created #2466 and will try to track a fix there.