[ruby-core:102851] [Ruby master Bug#17724] Pattern matching error message is confusing

Issue #17724 has been reported by jnchito (Junichi Ito).

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Bug #17724: Pattern matching error message is confusing
https://bugs.ruby-lang.org/issues/17724

* Author: jnchito (Junichi Ito)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin20]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
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When I use pattern match with instance variables, I get an error message like "expecting local variable or method"

``` ruby
@n = 1
case 1
in ^@n
  # ...
end
#=> syntax error, unexpected instance variable, expecting local variable or method (SyntaxError)
#   in ^@n
#       ^~
```

However using method is not allowed, either.

``` ruby
def n = 1
case 1
in ^n
  # ...
end
#=> n: no such local variable (SyntaxError)
```

I think the message "expecting local variable or method" is confusing and should be fixed like "expecting local variable."




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