message: Improved compilation messaging errors
diff: @@ -57,7 +57,7 @@ impl FromStr for Compiler {
  "singlepass" => Ok(Self::Singlepass),
  "cranelift" => Ok(Self::Cranelift),
  "llvm" => Ok(Self::LLVM),
  - backend => bail!("The backend {} does not exist", backend),
  + backend => bail!("The `{}` compiler does not exist.", backend),
  }
  }
  }
  @@ -115,8 +115,8 @@ impl CompilerOptions {
  feature = "compiler-llvm",
  )))]
  compiler => bail!(
  - "The compiler {:?} is not included in this binary.",
  - compiler
  + "The `{}` compiler is not included in this binary.",
  + compiler.to_string()
  ),
  };
  return Ok((config, compiler.to_string()));
  