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Weird attribute assignment syntax #12830

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FnControlOption opened this issue Dec 9, 2022 · 3 comments · May be fixed by #14815
Open

Weird attribute assignment syntax #12830

FnControlOption opened this issue Dec 9, 2022 · 3 comments · May be fixed by #14815
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kind:bug A bug in the code. Does not apply to documentation, specs, etc. topic:compiler:parser

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@FnControlOption
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In Ruby, the following code is invalid:

a = [:foo] * 3
a[0] = :bar
a.[](1) = :baz # syntax error

However, this works fine (by accident?) in Crystal, where a.[](1) = :baz is the same as a.[]=(1, :baz) (or a[1] = :baz)

Parser#can_be_assigned? probably should check if Call#has_parentheses is false when Call#name is "[]"

Here's my crystal -v:

Crystal 1.6.2 (2022-11-03)

LLVM: 14.0.6
Default target: x86_64-apple-macosx
@FnControlOption FnControlOption added the kind:bug A bug in the code. Does not apply to documentation, specs, etc. label Dec 9, 2022
@FnControlOption
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FnControlOption commented Dec 10, 2022 •
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Addendum: a.[] 1 = :baz also works in Crystal but doesn't in Ruby (a.[] 1 is a method call to [] with argument 1)

@straight-shoota
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a.[](1) = :baz and a.[] 1 = :baz should be invalid. The combination of standard call syntax with an operator method name and assignment is confusing.

Note that a.[]=(1, :baz) should continue to work, though.

@FnControlOption
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FnControlOption commented Jul 16, 2024 •
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a.[](1) = :baz is now a syntax error (most likely fixed in #14527)

All that's left now before this issue can be closed is a.[] 1 = :baz

@FnControlOption FnControlOption linked a pull request Jul 16, 2024 that will close this issue
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kind:bug A bug in the code. Does not apply to documentation, specs, etc. topic:compiler:parser
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Disallow weird assignments FnControlOption/crystal
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@straight-shoota @Blacksmoke16 @FnControlOption