[ruby-core:118219] [Ruby master Bug#20433] Hash.inspect for some hash returns syntax invalid representation

Issue #20433 has been updated by tompng (tomoya ishida).


I created a proof of concept patch for colon style inspect https://github.com/ruby/ruby/pull/10924

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Bug #20433: Hash.inspect for some hash returns syntax invalid representation
https://bugs.ruby-lang.org/issues/20433#change-108707

* Author: tompng (tomoya ishida)
* Status: Open
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
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For these hashes, Hash.inspect returns a syntax invalid representation:
~~~ruby
{ :a! => 1 } # {:a!=>1}
{ :a? => 1 } # {:a?=>1}
{ :* => 1 }  # {:*=>1}
{ :== => 1 } # {:===>1}
{ :< => 1 }  # {:<=>1}
~~~
`eval(hash.inspect)` will raise SyntaxError.
Although inspect does not guarantee that the result can be eval-ed, it'd be confusing for these few cases.

Maybe related to https://bugs.ruby-lang.org/issues/20235



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