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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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