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# Description Fixes: #11438 Take the following as example: ```nushell def spam [foo: string] { $'foo: ($foo | describe)' } def outer [--foo: string] { spam $foo } outer ``` When we call `outer`, type checker only check the all for `outer`, but doesn't check inside the body of `outer`. This pr is trying to introduce a type checking process through `Type::is_subtype()` during eval time. ## NOTE I'm not really sure if it's easy to make a check inside the body of `outer`. Adding an eval time type checker seems like an easier solution. As a result: `outer` will be caught by runtime, not parse time type checker cc @kubouch # User-Facing Changes After this pr the following call will failed: ```nushell > outer Error: nu:🐚:cant_convert × Can't convert to string. ╭─[entry #27:1:1] 1 │ def outer [--foo: any] { 2 │ spam $foo · ──┬─ · ╰── can't convert nothing to string 3 │ } ╰──── ``` # Tests + Formatting Done # After Submitting NaN |
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nu-protocol
The nu-protocol crate holds the definitions of structs/traits that are used throughout Nushell. This gives us one way to expose them to many other crates, as well as make these definitions available to each other, without causing mutually recursive dependencies.