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\u{00ad} character is sometimes parsed twice #77417

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bugadani opened this issue Oct 1, 2020 · 1 comment
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\u{00ad} character is sometimes parsed twice #77417

bugadani opened this issue Oct 1, 2020 · 1 comment
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A-parser Area: The parsing of Rust source code to an AST. C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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bugadani commented Oct 1, 2020 •
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See here: https://godbolt.org/z/sdv7a3

The println! outputs "f\u{ad}\u{ad}cali" - this isn't a println! issue, but the string literal also contains 2 \u{ad} characters.

Same example, but a little more visible: the following assert is supposed to pass:

assert_eq!(6, "f\u{AD}­cali".chars().count());

Issue exists since 1.0
@bugadani bugadani added the C-bug Category: This is a bug. label Oct 1, 2020
@jonas-schievink jonas-schievink added A-parser Area: The parsing of Rust source code to an AST. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Oct 1, 2020
@bugadani bugadani mentioned this issue Oct 1, 2020
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bugadani commented Oct 1, 2020

Error code ID10T. I managed to paste the shy character into the text, so it doesn't show up in the source but it IS there. Wow

@bugadani bugadani closed this as completed Oct 1, 2020
@bugadani bugadani mentioned this issue Oct 2, 2020
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bors added a commit to rust-lang/rust-clippy that referenced this issue Oct 2, 2020
@bors
Auto merge of #6105 - bugadani:sus-char, r=ebroto
15a7950 
Lint for invisible Unicode characters other than ZWSP

This PR extends the existing `zero_width_space` lint to look for other invisible characters as well (in this case, `\\u{ad}` soft hyphen.

I feel like this lint is the logical place to add the check, but I also realize the lint name is not particularly flexible, but I also understand that it shouldn't be renamed for compatibility reasons.

Open questions:
 - What other characters should trigger the lint?
 - What should be done with the lint name?
 - How to indicate the change in functionality?

Motivation behind this PR: rust-lang/rust#77417 - I managed to shoot myself in the foot by an invisible character pasted into my test case.
bors added a commit to rust-lang/rust-clippy that referenced this issue Oct 2, 2020
@bors
Auto merge of #6105 - bugadani:sus-char, r=ebroto
9408c68 
Lint for invisible Unicode characters other than ZWSP

This PR extends the existing `zero_width_space` lint to look for other invisible characters as well (in this case, `\\u{ad}` soft hyphen.

I feel like this lint is the logical place to add the check, but I also realize the lint name is not particularly flexible, but I also understand that it shouldn't be renamed for compatibility reasons.

Open questions:
 - What other characters should trigger the lint?
 - What should be done with the lint name?
 - How to indicate the change in functionality?

Motivation behind this PR: rust-lang/rust#77417 - I managed to shoot myself in the foot by an invisible character pasted into my test case.

changelog: rename [`zero_width_space`] to [`invisible_characters`] and add SHY and WJ to the list.
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A-parser Area: The parsing of Rust source code to an AST. C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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