something is very wrong if the default theme is missing

Error message

something is very wrong if the default theme is missing

What it means

Error "something is very wrong if the default theme is missing" thrown in sharkdp/bat.

Source

Thrown at src/assets.rs:211

    /// Look up a syntect theme by name.
    pub fn get_theme(&self, theme: &str) -> &Theme {
        match self.get_theme_set().get(theme) {
            Some(theme) => theme,
            None => {
                if theme == "ansi-light" || theme == "ansi-dark" {
                    bat_warning!("Theme '{theme}' is deprecated, using 'ansi' instead.");
                    return self.get_theme("ansi");
                }
                if !theme.is_empty() {
                    bat_warning!("Unknown theme '{theme}', using default.")
                }
                self.get_theme_set()
                    .get(
                        self.fallback_theme
                            .unwrap_or_else(|| default_theme(ColorScheme::Dark)),
                    )
                    .expect("something is very wrong if the default theme is missing")
            }
        }
    }

    pub(crate) fn get_syntax(
        &self,
        language: Option<&str>,
        fallback_syntax: Option<&str>,
        input: &mut OpenedInput,
        mapping: &SyntaxMapping,
    ) -> Result<SyntaxReferenceInSet<'_>> {
        if let Some(language) = language {
            let syntax_set = self.get_syntax_set()?;
            return syntax_set
                .find_syntax_by_token(language)
                .map(|syntax| SyntaxReferenceInSet { syntax, syntax_set })
                .ok_or_else(|| Error::UnknownSyntax(language.to_owned()));
        }

View on GitHub (pinned to b671e53c2c)

When it happens

Trigger: Thrown at src/assets.rs:211 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of sharkdp/bat@b671e53c2c (2026-08-16). Data as JSON: /api/errors/498574b737f39265. Report an issue: GitHub.