tseeker-pub/rust-crafting-interpreters-part-1
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Interpreter - Handle errors for multiple definitions of an argument

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This commit is contained in:
Emmanuel BENOîT 2023-01-02 20:08:05 +01:00
parent 7b20ec2f3a
commit cf3284cd88
1 changed files with 2 additions and 1 deletions
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src/interpreter/functions.rs
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@ -47,7 +47,8 @@ impl Callable for Function {
assert_eq!(arguments.len(), self.arity()); assert_eq!(arguments.len(), self.arity());
let param_env = Environment::create_child(environment); let param_env = Environment::create_child(environment);
for (arg, value) in izip!(self.params.iter(), arguments.into_iter()) { for (arg, value) in izip!(self.params.iter(), arguments.into_iter()) {
param_env.borrow_mut().define(&arg, Some(value)); // FIXME: duplicate parameter names should be detected in the parser
param_env.borrow_mut().define(&arg, Some(value))?;
} }
let child = Environment::create_child(&param_env); let child = Environment::create_child(&param_env);