Bug #7615: assignment to context variable changes the precedence order of function call with followed by ' (' (whitespace-bracket)

• Status: Closed
• Assignee: nobu (Nobuyoshi Nakada)
• Target version: -
• ruby -v: ruby 2.0.0dev (2012-12-01 trunk 38126) [x86_64-darwin12.2.0]
• Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN

[snoble (Steven Noble)]

this is similar to http://bugs.ruby-lang.org/issues/1801 but it wasn't pointed out then that ruby will use two different parsings at different times

note that in this code a and b have the same assignment code but are assigned different values
code:
def foo(x); 99; end
a = foo (44) / 11
foo = 99999999
b = foo (44) / 11
puts "a: #{a} b: #{b}" #output of "a: 99 b: 9"

The output of ruby_parser is:
s(:block,
s(:defn, :foo, s(:args, :x), s(:lit, 99))
s(:lasgn, :a, s(:call, nil, :foo, s(:call, s(:lit, 44), :/, s(:lit, 11)))),
s(:lasgn, :foo, s(:lit, 999999999)),
s(:lasgn, :b, s(:call, s(:call, nil, :foo, s(:lit, 44)), :/, s(:lit, 11)))
)

observed in 1.9.4 and 2.0.0-preview2, but does not occur in 1.8.7

[snoble (Steven Noble)]

is this result not extremely surprising to anyone else? I would expect a and b to be assigned the same value

[ko1 (Koichi Sasada)]

• Category set to core
• Assignee set to nobu (Nobuyoshi Nakada)
• Target version set to 2.0.0

Nobu, could you check it?

[mame (Yusuke Endoh)]

• Subject changed from assignment to context variable changes the precedence order of function call with followed by ' (' (whitespace-bracket) to assignment to context variable changes the precedence order of function call with followed by ' (' (whitespace-bracket)
• Status changed from Open to Assigned
• Target version changed from 2.0.0 to 2.6

Interesting, but I'm reluctant to fix this in 2.0.0 because it looks impractical and incompatible to 1.9.X.

--
Yusuke Endoh [e-mail]

[naruse (Yui NARUSE)]

• Target version deleted (2.6)

[jeremyevans0 (Jeremy Evans)]

• Status changed from Assigned to Closed

This was fixed between Ruby 2.4 and 2.5:

$ ruby24 -e '
> def foo(x); 99; end
> a = foo (44) / 11
> foo = 99999999
> b = foo (44) / 11
> puts "a: #{a} b: #{b}"'
a: 99 b: 9

$ ruby25 -e '
> def foo(x); 99; end
> a = foo (44) / 11
> foo = 99999999
> b = foo (44) / 11
> puts "a: #{a} b: #{b}"'
a: 99 b: 99