Commit a3762f60ad marked the current (:target) entry using background color. But then 11e736f3e8 set the background color for all entries. Thus we need another way to highlight the entry pointed at by the URL fragment.
Signed-off-by: Michał Kukieła <53443372+kukimik@users.noreply.github.com>
Example session:
```
» 1 + 1
The Roc compiler had an internal error.
Please file a bug report at
https://github.com/roc-lang/roc/issues/new
Please include the following data:
Error message: intentional panic
Stack backtrace:
0: std::backtrace_rs::backtrace::libunwind::trace
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/../../backtrace/src/backtrace/libunwind.rs:104:5
1: std::backtrace_rs::backtrace::trace_unsynchronized
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
2: std::backtrace::Backtrace::create
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/backtrace.rs:331:13
3: panic_hook
at ./crates/repl_cli/src/lib.rs:52:41
4: call<fn(&core::panic::panic_info::PanicInfo), (&core::panic::panic_info::PanicInfo)>
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/core/src/ops/function.rs:79:5
5: <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/alloc/src/boxed.rs:2029:9
6: std::panicking::rust_panic_with_hook
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/panicking.rs:785:13
7: std::panicking::begin_panic_handler::{{closure}}
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/panicking.rs:651:13
8: std::sys_common::backtrace::__rust_end_short_backtrace
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/sys_common/backtrace.rs:171:18
9: rust_begin_unwind
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/panicking.rs:647:5
10: core::panicking::panic_fmt
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/core/src/panicking.rs:72:14
11: step
at ./crates/repl_ui/src/repl_state.rs:66:9
12: {closure#1}
at ./crates/repl_cli/src/lib.rs:109:21
13: call_once<roc_repl_cli::main::{closure_env#1}, ()>
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/core/src/ops/function.rs:250:5
14: call_once<roc_repl_ui::repl_state::ReplAction, roc_repl_cli::main::{closure_env#1}>
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/core/src/panic/unwind_safe.rs:272:9
15: do_call<core::panic::unwind_safe::AssertUnwindSafe<roc_repl_cli::main::{closure_env#1}>, roc_repl_ui::repl_state::ReplAction>
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/panicking.rs:554:40
16: ___rust_try
17: try<roc_repl_ui::repl_state::ReplAction, core::panic::unwind_safe::AssertUnwindSafe<roc_repl_cli::main::{closure_env#1}>>
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/panicking.rs:518:19
18: catch_unwind<core::panic::unwind_safe::AssertUnwindSafe<roc_repl_cli::main::{closure_env#1}>, roc_repl_ui::repl_state::ReplAction>
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/panic.rs:142:14
19: main
at ./crates/repl_cli/src/lib.rs:108:30
20: main
at ./crates/cli/src/main.rs:321:16
21: call_once<fn() -> core::result::Result<(), std::io::error::Error>, ()>
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/core/src/ops/function.rs:250:5
22: __rust_begin_short_backtrace<fn() -> core::result::Result<(), std::io::error::Error>, core::result::Result<(), std::io::error::Error>>
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/sys_common/backtrace.rs:155:18
23: {closure#0}<core::result::Result<(), std::io::error::Error>>
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/rt.rs:166:18
24: core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/core/src/ops/function.rs:284:13
25: std::panicking::try::do_call
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/panicking.rs:554:40
26: std::panicking::try
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/panicking.rs:518:19
27: std::panic::catch_unwind
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/panic.rs:142:14
28: std::rt::lang_start_internal::{{closure}}
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/rt.rs:148:48
29: std::panicking::try::do_call
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/panicking.rs:554:40
30: std::panicking::try
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/panicking.rs:518:19
31: std::panic::catch_unwind
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/panic.rs:142:14
32: std::rt::lang_start_internal
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/rt.rs:148:20
33: lang_start<core::result::Result<(), std::io::error::Error>>
at /rustc/25ef9e3d85d934b27d9dada2f9dd52b1dc63bb04/library/std/src/rt.rs:165:17
34: _main
Machine Target: MacArm64
```
Remove branches on determining how let-bindings are introduced to the
scope. This is maybe a little more inefficient, but I think it is a huge
simplification.
One additional change this required was changing how fx suffixes are
checked. The current implementation would add additional constraints for
patterns in let bindings conditionally. However, this is unnecessary. I
believe it is sufficient to check the fx suffix by running the checks on
all introduced symbols after the type is well known (i.e. the body is
checked).
