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Range patterns of strings are accepted

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
82/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Active
Tech stack
rust
Domain
compilers

Research direction

Start at the :todo case in tests/checker/patterns.txt on the test/checker-edges branch, then inspect the relevant type-checking code in the boltlang-hir-ty crate. Add the case so a string range pattern is rejected while ranges over supported ordered types remain valid; done when the checker test passes.

Written by the indexing model from the issue text.

Description

bug scope:types

A range pattern of strings is accepted:

fn f(s: str) = match s { "a"..="z" => 1, _ => 2 };

Range patterns only make sense for types with an order that the compiler knows, like integers, floats and chars. A range of strings should be an error.

There's a :todo case in tests/checker/patterns.txt, on the branch test/checker-edges.

Crates: boltlang-hir-ty.

Dominant language
Rust
Stars
54
Forks
3
Avg merge
7m
Merged PRs (30d)
28

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