warning: panic message contains a brace --> $DIR/non-fmt-panic.rs:11:29 | LL | panic!("here's a brace: {"); | ^ | = note: `#[warn(non_fmt_panic)]` on by default = note: this message is not used as a format string, but will be in Rust 2021 help: add a "{}" format string to use the message literally | LL | panic!("{}", "here's a brace: {"); | ^^^^^ warning: panic message contains a brace --> $DIR/non-fmt-panic.rs:12:31 | LL | std::panic!("another one: }"); | ^ | = note: this message is not used as a format string, but will be in Rust 2021 help: add a "{}" format string to use the message literally | LL | std::panic!("{}", "another one: }"); | ^^^^^ warning: panic message contains an unused formatting placeholder --> $DIR/non-fmt-panic.rs:13:25 | LL | core::panic!("Hello {}"); | ^^ | = note: this message is not used as a format string when given without arguments, but will be in Rust 2021 help: add the missing argument | LL | core::panic!("Hello {}", ...); | ^^^^^ help: or add a "{}" format string to use the message literally | LL | core::panic!("{}", "Hello {}"); | ^^^^^ warning: panic message contains unused formatting placeholders --> $DIR/non-fmt-panic.rs:14:21 | LL | assert!(false, "{:03x} {test} bla"); | ^^^^^^ ^^^^^^ | = note: this message is not used as a format string when given without arguments, but will be in Rust 2021 help: add the missing arguments | LL | assert!(false, "{:03x} {test} bla", ...); | ^^^^^ help: or add a "{}" format string to use the message literally | LL | assert!(false, "{}", "{:03x} {test} bla"); | ^^^^^ warning: panic message is not a string literal --> $DIR/non-fmt-panic.rs:16:20 | LL | assert!(false, S); | ^ | = note: this is no longer accepted in Rust 2021 help: add a "{}" format string to Display the message | LL | assert!(false, "{}", S); | ^^^^^ warning: panic message contains braces --> $DIR/non-fmt-panic.rs:18:27 | LL | debug_assert!(false, "{{}} bla"); | ^^^^ | = note: this message is not used as a format string, but will be in Rust 2021 help: add a "{}" format string to use the message literally | LL | debug_assert!(false, "{}", "{{}} bla"); | ^^^^^ warning: panic message is not a string literal --> $DIR/non-fmt-panic.rs:19:12 | LL | panic!(C); | ^ | = note: this is no longer accepted in Rust 2021 help: add a "{}" format string to Display the message | LL | panic!("{}", C); | ^^^^^ help: or use std::panic::panic_any instead | LL | std::panic::panic_any(C); | ^^^^^^^^^^^^^^^^^^^^^ warning: panic message is not a string literal --> $DIR/non-fmt-panic.rs:20:12 | LL | panic!(S); | ^ | = note: this is no longer accepted in Rust 2021 help: add a "{}" format string to Display the message | LL | panic!("{}", S); | ^^^^^ help: or use std::panic::panic_any instead | LL | std::panic::panic_any(S); | ^^^^^^^^^^^^^^^^^^^^^ warning: panic message is not a string literal --> $DIR/non-fmt-panic.rs:21:17 | LL | std::panic!(123); | ^^^ | = note: this is no longer accepted in Rust 2021 help: add a "{}" format string to Display the message | LL | std::panic!("{}", 123); | ^^^^^ help: or use std::panic::panic_any instead | LL | std::panic::panic_any(123); | ^^^^^^^^^^^^^^^^^^^^^ warning: panic message is not a string literal --> $DIR/non-fmt-panic.rs:22:18 | LL | core::panic!(&*"abc"); | ^^^^^^^ | = note: this is no longer accepted in Rust 2021 help: add a "{}" format string to Display the message | LL | core::panic!("{}", &*"abc"); | ^^^^^ warning: panic message contains an unused formatting placeholder --> $DIR/non-fmt-panic.rs:23:12 | LL | panic!(concat!("{", "}")); | ^^^^^^^^^^^^^^^^^ | = note: this message is not used as a format string when given without arguments, but will be in Rust 2021 help: add the missing argument | LL | panic!(concat!("{", "}"), ...); | ^^^^^ help: or add a "{}" format string to use the message literally | LL | panic!("{}", concat!("{", "}")); | ^^^^^ warning: panic message contains braces --> $DIR/non-fmt-panic.rs:24:5 | LL | panic!(concat!("{", "{")); | ^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: this message is not used as a format string, but will be in Rust 2021 help: add a "{}" format string to use the message literally | LL | panic!("{}", concat!("{", "{")); | ^^^^^ warning: panic message contains an unused formatting placeholder --> $DIR/non-fmt-panic.rs:26:37 | LL | fancy_panic::fancy_panic!("test {} 123"); | ^^ | = note: this message is not used as a format string when given without arguments, but will be in Rust 2021 warning: panic message is not a string literal --> $DIR/non-fmt-panic.rs:29:31 | LL | fancy_panic::fancy_panic!(S); | ^ | = note: this is no longer accepted in Rust 2021 warning: panic message is not a string literal --> $DIR/non-fmt-panic.rs:36:12 | LL | panic!(a!()); | ^^^^ | = note: this is no longer accepted in Rust 2021 help: add a "{}" format string to Display the message | LL | panic!("{}", a!()); | ^^^^^ help: or use std::panic::panic_any instead | LL | std::panic::panic_any(a!()); | ^^^^^^^^^^^^^^^^^^^^^ warning: panic message is not a string literal --> $DIR/non-fmt-panic.rs:38:12 | LL | panic!(format!("{}", 1)); | ^^^^^^^^^^^^^^^^ | = note: this is no longer accepted in Rust 2021 = note: the panic!() macro supports formatting, so there's no need for the format!() macro here help: remove the `format!(..)` macro call | LL | panic!("{}", 1); | -- -- warning: panic message is not a string literal --> $DIR/non-fmt-panic.rs:40:12 | LL | panic![123]; | ^^^ | = note: this is no longer accepted in Rust 2021 help: add a "{}" format string to Display the message | LL | panic!["{}", 123]; | ^^^^^ help: or use std::panic::panic_any instead | LL | std::panic::panic_any(123); | ^^^^^^^^^^^^^^^^^^^^^^ ^ warning: panic message is not a string literal --> $DIR/non-fmt-panic.rs:41:12 | LL | panic!{123}; | ^^^ | = note: this is no longer accepted in Rust 2021 help: add a "{}" format string to Display the message | LL | panic!{"{}", 123}; | ^^^^^ help: or use std::panic::panic_any instead | LL | std::panic::panic_any(123); | ^^^^^^^^^^^^^^^^^^^^^^ ^ warning: 18 warnings emitted