[ruby-core:73816] [Ruby trunk Bug#12073] local variable interferes with keyword arguments

Issue #12073 has been reported by Josh Cheek.

----------------------------------------
Bug #12073: local variable interferes with keyword arguments
https://bugs.ruby-lang.org/issues/12073

* Author: Josh Cheek
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin13]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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This code causes a syntax error:

~~~
def a(b:)
  b
end
a = 1
a b: 9
 
# !> program.rb:5: syntax error, unexpected ':', expecting end-of-input
# !> a b: (9)
# !>     ^
~~~

However, if we remove the local assignment it works

~~~
def a(b:)
  b
end
a b: 9 # => 9
~~~

Or if we use parentheses it works

~~~
def a(b:)
  b
end
a = 1
a(b: 9) # => 9
~~~

Or if we use non-keyword arguments it works

~~~
def a(b)
  b
end
a = 1
a 9 # => 9
~~~



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