Without this change
when the test returns a `Result`, `cargo test` does not show
the line number.
To make the tests as easy to debug as the panicking tests,
enable `backtrace` feature on `anyhow` and add debug information
to add source line numbers to backtraces.
Now running `RUST_BACKTRACE=1 cargo test` produces backtraces
with the line numbers. For example:
Error: near ",": syntax error in SELECT COUNT(,,*) FROM msgs_status_updates; at offset 13
Caused by:
Error code 1: SQL error or missing database
Stack backtrace:
0: <core::result::Result<T,F> as core::ops::try_trait::FromResidual<core::result::Result<core::convert::Infallible,E>>>::from_residual
at /rustc/79e9716c980570bfd1f666e3b16ac583f0168962/library/core/src/result.rs:1962:27
1: deltachat::sql::Sql::query_row::{{closure}}::{{closure}}
at ./src/sql.rs:466:23
2: deltachat::sql::Sql::call::{{closure}}::{{closure}}
at ./src/sql.rs:379:55
3: tokio::runtime::context::runtime_mt::exit_runtime
at /home/user/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.34.0/src/runtime/context/runtime_mt.rs:35:5
4: tokio::runtime::scheduler::multi_thread::worker::block_in_place
at /home/user/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.34.0/src/runtime/scheduler/multi_thread/worker.rs:438:9
5: tokio::runtime::scheduler::block_in_place::block_in_place
at /home/user/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.34.0/src/runtime/scheduler/block_in_place.rs:20:5
6: tokio::task::blocking::block_in_place
at /home/user/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.34.0/src/task/blocking.rs:78:9
7: deltachat::sql::Sql::call::{{closure}}
at ./src/sql.rs:379:19
8: deltachat::sql::Sql::query_row::{{closure}}
at ./src/sql.rs:469:10
9: deltachat::sql::Sql::count::{{closure}}
at ./src/sql.rs:443:76
10: deltachat::webxdc::tests::change_logging_webxdc::{{closure}}
at ./src/webxdc.rs:2644:18
11: <core::pin::Pin<P> as core::future::future::Future>::poll
at /rustc/79e9716c980570bfd1f666e3b16ac583f0168962/library/core/src/future/future.rs:125:9
12: tokio::runtime::park::CachedParkThread::block_on::{{closure}}
at /home/user/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.34.0/src/runtime/park.rs:282:63
13: tokio::runtime::coop::with_budget
at /home/user/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.34.0/src/runtime/coop.rs:107:5
tokio::runtime::coop::budget
at /home/user/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.34.0/src/runtime/coop.rs:73:5
tokio::runtime::park::CachedParkThread::block_on
at /home/user/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.34.0/src/runtime/park.rs:282:31
14: tokio::runtime::context::blocking::BlockingRegionGuard::block_on
at /home/user/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.34.0/src/runtime/context/blocking.rs:66:9
...
Line 10 of the backtrace contains the line number in the test (2644).
