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allow define it as a variable inside closure (#12888)

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# Description
Fixes: #12690 

The issue is happened after
https://github.com/nushell/nushell/pull/12056 is merged. It will raise
error if user doesn't supply required parameter when run closure with
do.
And parser adds a `$it` parameter when parsing closure or block
expression.

I believe the previous behavior is because we allow such syntax on
previous version(0.44):
```nushell
let x = { print $it }
```
But it's no longer allowed after 0.60.  So I think they can be removed.

# User-Facing Changes
```nushell
let tmp = {
  let it = 42
  print $it
}

do -c $tmp
```
should be possible again.

# Tests + Formatting
Added 1 test
This commit is contained in:
Wind 2024-05-17 08:03:13 +08:00 committed by GitHub
parent 6891267b53
commit 8adf3406e5
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
2 changed files with 7 additions and 28 deletions
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7
crates/nu-command/tests/commands/do_.rs
View File

@ -66,3 +66,10 @@ fn ignore_error_works_with_list_stream() {
let actual = nu!(r#"do -i { ["a", null, "b"] | ansi strip }"#); let actual = nu!(r#"do -i { ["a", null, "b"] | ansi strip }"#);
assert!(actual.err.is_empty()); assert!(actual.err.is_empty());
} }
#[test]
fn run_closure_with_it_using() {
let actual = nu!(r#"let x = {let it = 3; $it}; do $x"#);
assert!(actual.err.is_empty());
assert_eq!(actual.out, "3");
}

28
crates/nu-parser/src/parser.rs
View File

@ -4177,20 +4177,6 @@ pub fn parse_block_expression(working_set: &mut StateWorkingSet, span: Span) ->
if let Some(signature) = signature { if let Some(signature) = signature {
output.signature = signature.0; output.signature = signature.0;
} else if let Some(last) = working_set.delta.scope.last() {
// FIXME: this only supports the top $it. Is this sufficient?
if let Some(var_id) = last.get_var(b"$it") {
let mut signature = Signature::new("");
signature.required_positional.push(PositionalArg {
var_id: Some(*var_id),
name: "$it".into(),
desc: String::new(),
shape: SyntaxShape::Any,
default_value: None,
});
output.signature = Box::new(signature);
}
} }
output.span = Some(span); output.span = Some(span);
@ -4518,20 +4504,6 @@ pub fn parse_closure_expression(
if let Some(signature) = signature { if let Some(signature) = signature {
output.signature = signature.0; output.signature = signature.0;
} else if let Some(last) = working_set.delta.scope.last() {
// FIXME: this only supports the top $it. Is this sufficient?
if let Some(var_id) = last.get_var(b"$it") {
let mut signature = Signature::new("");
signature.required_positional.push(PositionalArg {
var_id: Some(*var_id),
name: "$it".into(),
desc: String::new(),
shape: SyntaxShape::Any,
default_value: None,
});
output.signature = Box::new(signature);
}
} }
output.span = Some(span); output.span = Some(span);