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# Description As part of fixing https://github.com/nushell/nushell/issues/13586, this PR checks the types of the operands when creating a range. Stuff like `0..(glob .)` will be rejected at parse time. Additionally, `0..$x` will be treated as a range and rejected if `x` is not defined, rather than being treated as a string. A separate PR will need to be made to do reject streams at runtime, so that stuff like `0..(open /dev/random)` doesn't hang. Internally, this PR adds a `ParseError::UnsupportedOperationTernary` variant, for when you have a range like `1..2..(glob .)`. # User-Facing Changes Users will now receive an error if any of the operands in the ranges they construct have types that aren't compatible with `Type::Number`. Additionally, if a piece of code looks like a range but some parse error is encountered while parsing it, that piece of code will still be treated as a range and the user will be shown the parse error. This means that a piece of code like `0..$x` will be treated as a range no matter what. Previously, if `x` weren't the expression would've been treated as a string `"0..$x"`. I feel like it makes the language less complicated if we make it less context-sensitive. Here's an example of the error you get: ``` > 0..(glob .) Error: nu::parser::unsupported_operation × range is not supported between int and any. ╭─[entry #1:1:1] 1 │ 0..(glob .) · ─────┬─────┬┬ · │ │╰── any · │ ╰── int · ╰── doesn't support these values ╰──── ``` And as an image:  Note: I made the operands themselves (above, `(glob .)`) be garbage, rather than the `..` operator itself. This doesn't match the behavior of the math operators (if you do `1 + "foo"`, `+` gets highlighted red). This is because with ranges, the range operators aren't `Expression`s themselves, so they can't be turned into garbage. I felt like here, it makes more sense to highlight the individual operand anyway. |
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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.