[ruby-core:101101] [Ruby master Bug#17348] Shadowed method can not be evaluated on the line that it is shadowed

Issue #17348 has been reported by d-snp (Tinco Andringa).

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Bug #17348: Shadowed method can not be evaluated on the line that it is shadowed
https://bugs.ruby-lang.org/issues/17348

* Author: d-snp (Tinco Andringa)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-darwin19]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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I encountered this in the code a junior Rubyist wrote. Rewriting to more logical code solved our problem, but in my opinion it should not have been an error. I reduced the code to this:

``` ruby
def a
  ""
end
a = a[0]
puts a.inspect
```

Expected: `nil`
Got: 

```
Traceback (most recent call last):
shadowed.rb:4:in `<main>': undefined method `[]' for nil:NilClass (NoMethodError)
```

Note that:

``` ruby
a = ""
a = a[0]
puts a.inspect
```

Does work as expected, so it is specifically when a method is shadowed that this unexpected behaviour occurs.



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