Method declare_user_callable

core/src/compiler/syms.rs:200–215

Defines a new user-defined `vref` callable with `md` metadata.

(
        &mut self,
        vref: &VarRef,
        md: Rc<CallableMetadata>,
    )

    /// Defines a new user-defined `vref` callable with `md` metadata.
    pub(crate) fn declare_user_callable(
        &mut self,
        vref: &VarRef,
        md: Rc<CallableMetadata>,
    ) -> Result<()> {
        let key = SymbolKey::from(&vref.name);
        if self.globals.get(&key).is_some() {
            return Err(Error::AlreadyDefined(vref.clone()));
        }
        if let Some(previous_md) = self.user_callables.insert(key.clone(), md.clone())
            && previous_md != md
        {
            return Err(Error::AlreadyDefined(vref.clone()));
        }
        Ok(())
    }

    /// Gets a callable by its name `key`.
    pub(crate) fn get_callable(&self, key: &SymbolKey) -> Option<Rc<CallableMetadata>> {