pub fn as_env(&self) -> Option<&EnvInstruction> {
    match self {
      Instruction::Env(e) => Some(e),
      _ => None,
    }
  }
/// Attempts to convert this instruction into an EnvInstruction, returning
/// None if impossible.
Attempts to convert this instruction into an EnvInstruction, returning
None if impossible.
Attempts to convert this instruction into an EnvInstruction returning None if impossible .
pub fn as_env(&self) -> Option<&EnvInstruction> {
    match self {
      Instruction::Env(e) => Some(e),
      _ => None,
    }
  }
pub fn as_env ( & self ) -> Option < & EnvInstruction > { match self { Instruction :: Env ( e ) => Some ( e ) , _ => None , } }
Attempts to convert this instruction into an EnvInstruction, returning
None if impossible.
Attempts to convert this instruction into an EnvInstruction returning None if impossible .
&self