[INFO] cloning repository https://github.com/ljflores/Lisp_Interpreter
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ljflores/Lisp_Interpreter" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fljflores%2FLisp_Interpreter", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fljflores%2FLisp_Interpreter'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1e548a0d08ee6bcd94071297657f29b91b8ec046
[INFO] checking ljflores/Lisp_Interpreter/1e548a0d08ee6bcd94071297657f29b91b8ec046 against master#733108b6d4acaa93fe26ae281ea305aacd6aac4e for pr-148967
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fljflores%2FLisp_Interpreter" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/ljflores/Lisp_Interpreter
[INFO] finished tweaking git repo https://github.com/ljflores/Lisp_Interpreter
[INFO] tweaked toml for git repo https://github.com/ljflores/Lisp_Interpreter written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/ljflores/Lisp_Interpreter on toolchain 733108b6d4acaa93fe26ae281ea305aacd6aac4e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+733108b6d4acaa93fe26ae281ea305aacd6aac4e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/ljflores/Lisp_Interpreter already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+733108b6d4acaa93fe26ae281ea305aacd6aac4e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+733108b6d4acaa93fe26ae281ea305aacd6aac4e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d36ad4236e67ee0f91a74f67d871acda7ad4c564ed2594b169186f677379cb34
[INFO] running `Command { std: "docker" "start" "-a" "d36ad4236e67ee0f91a74f67d871acda7ad4c564ed2594b169186f677379cb34", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d36ad4236e67ee0f91a74f67d871acda7ad4c564ed2594b169186f677379cb34", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d36ad4236e67ee0f91a74f67d871acda7ad4c564ed2594b169186f677379cb34", kill_on_drop: false }`
[INFO] [stdout] d36ad4236e67ee0f91a74f67d871acda7ad4c564ed2594b169186f677379cb34
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+733108b6d4acaa93fe26ae281ea305aacd6aac4e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 68a7ddc5c55a72ce06364d1711b2455ba2f87918de88cf0038fe3fc195c3e9e0
[INFO] running `Command { std: "docker" "start" "-a" "68a7ddc5c55a72ce06364d1711b2455ba2f87918de88cf0038fe3fc195c3e9e0", kill_on_drop: false }`
[INFO] [stderr]     Checking mlisp v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/parse.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 59 |             _ => ParseResult::Failure(ParseError::BadParse(format!("unknown token: {:?}", *t))),
[INFO] [stdout]    |             ^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/parse.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 28 |             Token::LPar => {
[INFO] [stdout]    |             ----------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 48 |             Token::RPar => {
[INFO] [stdout]    |             ----------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 51 |             Token::Literal(s) => {
[INFO] [stdout]    |             ----------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 59 |             _ => ParseResult::Failure(ParseError::BadParse(format!("unknown token: {:?}", *t))),
[INFO] [stdout]    |             ^ collectively making this unreachable
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]   --> src/parse.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 59 |             _ => ParseResult::Failure(ParseError::BadParse(format!("unknown token: {:?}", *t))),
[INFO] [stdout]    |             ^ no value can reach this
[INFO] [stdout]    |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]   --> src/parse.rs:59:13
[INFO] [stdout]    |
[INFO] [stdout] 28 |             Token::LPar => {
[INFO] [stdout]    |             ----------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 48 |             Token::RPar => {
[INFO] [stdout]    |             ----------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 51 |             Token::Literal(s) => {
[INFO] [stdout]    |             ----------------- matches some of the same values
[INFO] [stdout] ...
[INFO] [stdout] 59 |             _ => ParseResult::Failure(ParseError::BadParse(format!("unknown token: {:?}", *t))),
[INFO] [stdout]    |             ^ collectively making this unreachable
[INFO] [stdout]    = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> tests/parse_tests.rs:10:34
[INFO] [stdout]    |
[INFO] [stdout] 10 |             |err| assert!(false, format!("{:?}", err)),
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this usage of `assert!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]    = note: the `assert!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout]    = note: `#[warn(non_fmt_panics)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]    |
[INFO] [stdout] 10 -             |err| assert!(false, format!("{:?}", err)),
[INFO] [stdout] 10 +             |err| assert!(false, "{:?}", err),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> tests/parse_tests.rs:18:34
[INFO] [stdout]    |
[INFO] [stdout] 18 |             |err| assert!(false, format!("{:?}", err)),
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this usage of `assert!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]    = note: the `assert!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]    |
[INFO] [stdout] 18 -             |err| assert!(false, format!("{:?}", err)),
[INFO] [stdout] 18 +             |err| assert!(false, "{:?}", err),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> tests/parse_tests.rs:35:34
[INFO] [stdout]    |
[INFO] [stdout] 35 |             |err| assert!(false, format!("{:?}", err)),
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this usage of `assert!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]    = note: the `assert!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]    |
[INFO] [stdout] 35 -             |err| assert!(false, format!("{:?}", err)),
[INFO] [stdout] 35 +             |err| assert!(false, "{:?}", err),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> tests/parse_tests.rs:53:34
[INFO] [stdout]    |
[INFO] [stdout] 53 |             |err| assert!(false, format!("{:?}", err)),
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this usage of `assert!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]    = note: the `assert!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]    |
[INFO] [stdout] 53 -             |err| assert!(false, format!("{:?}", err)),
[INFO] [stdout] 53 +             |err| assert!(false, "{:?}", err),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> tests/parse_tests.rs:83:34
[INFO] [stdout]    |
[INFO] [stdout] 83 |             |err| assert!(false, format!("{:?}", err)),
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this usage of `assert!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]    = note: the `assert!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]    |
[INFO] [stdout] 83 -             |err| assert!(false, format!("{:?}", err)),
[INFO] [stdout] 83 +             |err| assert!(false, "{:?}", err),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]  --> tests/lex_tests.rs:8:34
[INFO] [stdout]   |
[INFO] [stdout] 8 |             |err| assert!(false, format!("{:?}", err)),
[INFO] [stdout]   |                                  ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: this usage of `assert!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]   = note: the `assert!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout]   = note: `#[warn(non_fmt_panics)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]   |
[INFO] [stdout] 8 -             |err| assert!(false, format!("{:?}", err)),
[INFO] [stdout] 8 +             |err| assert!(false, "{:?}", err),
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> tests/lex_tests.rs:19:34
[INFO] [stdout]    |
[INFO] [stdout] 19 |             |err| assert!(false, format!("{:?}", err)),
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this usage of `assert!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]    = note: the `assert!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]    |
[INFO] [stdout] 19 -             |err| assert!(false, format!("{:?}", err)),
[INFO] [stdout] 19 +             |err| assert!(false, "{:?}", err),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> tests/lex_tests.rs:30:34
[INFO] [stdout]    |
[INFO] [stdout] 30 |             |err| assert!(false, format!("{:?}", err)),
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this usage of `assert!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]    = note: the `assert!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]    |
[INFO] [stdout] 30 -             |err| assert!(false, format!("{:?}", err)),
[INFO] [stdout] 30 +             |err| assert!(false, "{:?}", err),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> tests/lex_tests.rs:80:34
[INFO] [stdout]    |
[INFO] [stdout] 80 |             |err| assert!(false, format!("{:?}", err)),
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this usage of `assert!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]    = note: the `assert!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]    |
[INFO] [stdout] 80 -             |err| assert!(false, format!("{:?}", err)),
[INFO] [stdout] 80 +             |err| assert!(false, "{:?}", err),
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> tests/eval_tests.rs:443:32
[INFO] [stdout]     |
[INFO] [stdout] 443 |                 assert!(false, format!("Expected FNum(6.0), got {:?}", e));
[INFO] [stdout]     |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this usage of `assert!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]     = note: the `assert!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout]     = note: `#[warn(non_fmt_panics)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]     |
[INFO] [stdout] 443 -                 assert!(false, format!("Expected FNum(6.0), got {:?}", e));
[INFO] [stdout] 443 +                 assert!(false, "Expected FNum(6.0), got {:?}", e);
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> tests/eval_tests.rs:446:28
[INFO] [stdout]     |
[INFO] [stdout] 446 |             assert!(false, format!("Expected Expr::fnum(6.0), got {:?}", r2));
[INFO] [stdout]     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this usage of `assert!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]     = note: the `assert!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]     |
[INFO] [stdout] 446 -             assert!(false, format!("Expected Expr::fnum(6.0), got {:?}", r2));
[INFO] [stdout] 446 +             assert!(false, "Expected Expr::fnum(6.0), got {:?}", r2);
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> tests/eval_tests.rs:522:32
[INFO] [stdout]     |
[INFO] [stdout] 522 |             |e| assert!(false, format!("got error {}", e)),
[INFO] [stdout]     |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this usage of `assert!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]     = note: the `assert!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]     |
[INFO] [stdout] 522 -             |e| assert!(false, format!("got error {}", e)),
[INFO] [stdout] 522 +             |e| assert!(false, "got error {}", e),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> tests/eval_tests.rs:532:41
[INFO] [stdout]     |
[INFO] [stdout] 532 |             .map_err(|e| assert!(false, format!("got error {}", e)));
[INFO] [stdout]     |                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this usage of `assert!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]     = note: the `assert!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]     |
[INFO] [stdout] 532 -             .map_err(|e| assert!(false, format!("got error {}", e)));
[INFO] [stdout] 532 +             .map_err(|e| assert!(false, "got error {}", e));
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> tests/eval_tests.rs:574:13
[INFO] [stdout]     |
[INFO] [stdout] 574 |             format!("Expected add_var to fail, but it succeeded: {:?}", r)
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this usage of `assert!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]     = note: the `assert!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]     |
[INFO] [stdout] 574 -             format!("Expected add_var to fail, but it succeeded: {:?}", r)
[INFO] [stdout] 574 +             "Expected add_var to fail, but it succeeded: {:?}", r
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]    --> tests/eval_tests.rs:673:37
[INFO] [stdout]     |
[INFO] [stdout] 673 |             .map(|x| assert!(false, format!("Expected Err, got {:?}", x)));
[INFO] [stdout]     |                                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this usage of `assert!()` is deprecated; it will be a hard error in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/panic-macro-consistency.html>
[INFO] [stdout]     = note: the `assert!()` macro supports formatting, so there's no need for the `format!()` macro here
[INFO] [stdout] help: remove the `format!(..)` macro call
[INFO] [stdout]     |
[INFO] [stdout] 673 -             .map(|x| assert!(false, format!("Expected Err, got {:?}", x)));
[INFO] [stdout] 673 +             .map(|x| assert!(false, "Expected Err, got {:?}", x));
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.51s
[INFO] running `Command { std: "docker" "inspect" "68a7ddc5c55a72ce06364d1711b2455ba2f87918de88cf0038fe3fc195c3e9e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "68a7ddc5c55a72ce06364d1711b2455ba2f87918de88cf0038fe3fc195c3e9e0", kill_on_drop: false }`
[INFO] [stdout] 68a7ddc5c55a72ce06364d1711b2455ba2f87918de88cf0038fe3fc195c3e9e0