You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: lib.rs
    path of file: ./repos/ZLUDA/ptx/src
    
    the code of the file until where you have to start completion: #[cfg(test)]
extern crate paste;
#[macro_use]
extern crate lalrpop_util;

extern crate half;
#[cfg(test)]
extern crate hip_runtime_sys as hip;

lalrpop_mod!(ptx);

pub mod ast;
mod emit;
pub mod llvm;
pub mod raytracing;
#[cfg(test)]
mod test;
pub mod translate;

pub use crate::ptx::ModuleParser;
use ast::PtxError;
pub use lalrpop_util::lexer::Token;
pub
    
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self.1 {
            ParseError::User {
                error: PtxError::UnrecognizedStatement { start, end },
            } => self.fmt_unrecognized(f, *start, *end, "statement"),
            ParseError::User {
                error: PtxError::UnrecognizedDirective { start, end },
            } => self.fmt_unrecognized(f, *start, *end, "directive"),
            _ => self.1.fmt(f),
        }
    }