Bug #8140: Incorrect warning: `+' after local variable is interpreted as binary operator

• Status: Closed
• Assignee: matz (Yukihiro Matsumoto)
• Target version: -
• ruby -v: ruby 1.9.3p374 (2013-01-15 revision 38858) [x86_64-darwin12.2.1]
• Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN

[glyn (Glyn Normington)]

The statement:

puts '' +''

generates an invalid warning when executed with "ruby -w" which (a) implies a syntactical ambiguity where there is none, and (b) refers to a "local variable" of which there are none.

Note that:

puts ''+''

and:

puts '' + ''

produce no warnings.

[jsc (Justin Collins)]

glyn (Glyn Normington) wrote:

The statement:

puts '' +''

generates an invalid warning when executed with "ruby -w" which (a) implies a syntactical ambiguity where there is none, and (b) refers to a "local variable" of which there are none.

The message as of ruby-1.9.3-p551 was:

$ ruby -w
'' +''
-:1: warning: `+' after local variable is interpreted as binary operator
-:1: warning: even though it seems like unary operator

As of 2.1.10 (at least), the message now includes "or literal" to address point (b):

$ ruby -w
'' +''
-:1: warning: `+' after local variable or literal is interpreted as binary operator
-:1: warning: even though it seems like unary operator

[jeremyevans0 (Jeremy Evans)]

• Status changed from Open to Closed