custom_error.rs

use annotate_snippets::renderer::OutputTheme;
use annotate_snippets::{AnnotationKind, Group, Level, Renderer, Snippet};

fn main() {
    let source = r#"//@ compile-flags: -Ztreat-err-as-bug
//@ failure-status: 101
//@ error-pattern: aborting due to `-Z treat-err-as-bug=1`
//@ error-pattern: [eval_static_initializer] evaluating initializer of static `C`
//@ normalize-stderr: "note: .*\n\n" -> ""
//@ normalize-stderr: "thread 'rustc' panicked.*:\n.*\n" -> ""
//@ rustc-env:RUST_BACKTRACE=0

#![crate_type = "rlib"]

pub static C: u32 = 0 - 1;
//~^ ERROR could not evaluate static initializer
"#;
    let message = Level::ERROR
        .text(Some("error: internal compiler error"))
        .header("could not evaluate static initializer")
        .id("E0080")
        .group(
            Group::new().element(
                Snippet::source(source)
                    .origin("$DIR/err.rs")
                    .fold(true)
                    .annotation(
                        AnnotationKind::Primary
                            .span(386..391)
                            .label("attempt to compute `0_u32 - 1_u32`, which would overflow"),
                    ),
            ),
        );

    let renderer = Renderer::styled().theme(OutputTheme::Unicode);
    anstream::println!("{}", renderer.render(message));
}