nushell functions see tables as non-table and non-tables as table #7699
Description
Describe the bug
we've noticed, with @Eldyj and @fdncred over on the discord server a kinda strange behaviour when annotating an argument with the table type 😮
in the example below, i've tried to simplify the original lesscase function into what's causing the issue only
- the
: tablein the signature
original discussion: https://discord.com/channels/601130461678272522/615253963645911060/1060542132848431144
How to reproduce
define a foo command with
def foo [tab: table] {
$tab | describe
$tab
}run the following tests
1. expected to fail
> foo 10
Error: nu::parser::parse_mismatch (link)
× Parse mismatch during operation.
╭─[entry #9:1:1]
1 │ foo 10
· ─┬
· ╰── expected table
╰────> foo "foo"
Error: nu::parser::parse_mismatch (link)
× Parse mismatch during operation.
╭─[entry #10:1:1]
1 │ foo "foo"
· ──┬──
· ╰── expected table
╰────2. should fail because they violate the signature
> foo []
list<any>> foo [1, 2, 3]
list<int>
╭───┬───╮
│ 0 │ 1 │
│ 1 │ 2 │
│ 2 │ 3 │
╰───┴───╯> foo [foo]
list<string>
╭───┬─────╮
│ 0 │ foo │
╰───┴─────╯> foo {a: "A", b: "B"}
record<a: string, b: string>
╭───┬───╮
│ a │ A │
│ b │ B │
╰───┴───╯3. should not fail because it respects the signature but still fails
> foo [[a b]; [1 2] [3, 4]]
Error: nu::parser::type_mismatch (link)
× Type mismatch.
╭─[entry #15:1:1]
1 │ foo [[a b]; [1 2] [3, 4]]
· ──────────┬──────────
· ╰── expected List(Any), found Table([])
╰────note that
> [[a b]; [1 2] [3, 4]] | describe
table<a: int, b: int>Expected behavior
i expected the following to work, and they did
> foo 10
> foo "foo"i kinda expected the following to fail
> foo []
> foo [1, 2, 3]
> foo [foo]
> foo {a: "A", b: "B"}
in the end, the four above are some particular views of table, imo everything apart from basic types such as int can be seen as a table, right?
i definitely expected the last one to work, because describe says it's a table
> foo [[a b]; [1 2] [3, 4]]Screenshots
No response
Configuration
| key | value |
|---|---|
| version | 0.73.1 |
| branch | main |
| commit_hash | a9bdc65 |
| build_os | linux-x86_64 |
| build_target | x86_64-unknown-linux-gnu |
| rust_version | rustc 1.66.0 (69f9c33d7 2022-12-12) (Arch Linux rust 1:1.66.0-1) |
| cargo_version | cargo 1.66.0 |
| pkg_version | 0.73.1 |
| build_time | 2023-01-06 19:10:15 +01:00 |
| build_rust_channel | debug |
| features | database, default, trash, which, zip |
| installed_plugins |
Additional context
No response