1use rustc_span::{Symbol, sym};23#[derive(Debug)]4pub enum EntryPointType {5    /// This function is not an entrypoint.6    None,7    /// This is a function called `main` at the root level.8    /// ```9    /// fn main() {}10    /// ```11    MainNamed,12    /// This is a function with the `#[rustc_main]` attribute.13    /// Used by the testing harness to create the test entrypoint.14    /// ```ignore (clashes with test entrypoint)15    /// #[rustc_main]16    /// fn main() {}17    /// ```18    RustcMainAttr,19    /// This function is **not** an entrypoint but simply named `main` (not at the root).20    /// This is only used for diagnostics.21    /// ```22    /// #[allow(dead_code)]23    /// mod meow {24    ///     fn main() {}25    /// }26    /// ```27    OtherMain,28}2930pub fn entry_point_type(31    has_rustc_main: bool,32    at_root: bool,33    name: Option<Symbol>,34) -> EntryPointType {35    if has_rustc_main {36        EntryPointType::RustcMainAttr37    } else if let Some(name) = name38        && name == sym::main39    {40        if at_root {41            // This is a top-level function so it can be `main`.42            EntryPointType::MainNamed43        } else {44            EntryPointType::OtherMain45        }46    } else {47        EntryPointType::None48    }49}