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* [ruby-core:120878] [Ruby master Bug#21112] Type in error message when an incorrect key is used with WeakKeyMap
@ 2025-02-04 19:18 andrykonchin (Andrew Konchin) via ruby-core
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From: andrykonchin (Andrew Konchin) via ruby-core @ 2025-02-04 19:18 UTC (permalink / raw)
  To: ruby-core; +Cc: andrykonchin (Andrew Konchin)

Issue #21112 has been reported by andrykonchin (Andrew Konchin).

----------------------------------------
Bug #21112: Type in error message when an incorrect key is used with WeakKeyMap 
https://bugs.ruby-lang.org/issues/21112

* Author: andrykonchin (Andrew Konchin)
* Status: Open
* ruby -v: 3.4.1
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
The `ObjectSpace::WeakKeyMap#[]=` method raises exception when key is either Symbol, Numeric or true/false/nil but error message looks like a bit incorrect:

```ruby
m = ObjectSpace::WeakKeyMap.new
m[:a] = 1
# 'ObjectSpace::WeakKeyMap#[]=': WeakKeyMap must be garbage collectable (ArgumentError)
```

The error message `WeakKeyMap must be garbage collectable` looks like should be `WeakKeyMap key must be garbage collectable`.



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