Suppress Ruby warning when RUBYOPT=-w exists
#2143
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Problem ====== If `RUBYOPT=-w` exists, Ruby warns when we execute `:ruby` at first time. Reproduce ------ Start Vim with `RUBYOPT` environment ```bash $ RUBYOPT='-w' vim -N -u NONE ``` Execute `:ruby` ```vim :ruby puts "hello" ``` stderr ``` -e:1: warning: possibly useless use of a literal in void context ``` Cause ==== Vim executes Ruby like `ruby -e0`. Then the `0` is in void context. So, Ruby warns about it. Solution ====== Assign 0 to `_`. It suppresses the warning. And it does nothing.
Codecov Report
@@ Coverage Diff @@
## master #2143 +/- ##
==========================================
+ Coverage 73.94% 73.96% +0.01%
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Files 90 90
Lines 131877 131877
Branches 28961 28960 -1
==========================================
+ Hits 97518 97539 +21
+ Misses 34336 34315 -21
Partials 23 23
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adizero
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May 19, 2018
Problem: Ruby command triggers a warning when RUBYOPT is set to "-w". Solution: use "-e_=0" instead of "-e0". (Masataka Pocke Kuwabara, closes vim#2143)
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Problem
If
RUBYOPT=-wexists, Ruby warns when we execute:rubyat first time.Reproduce
Start Vim with
RUBYOPTenvironment$ RUBYOPT='-w' vim -N -u NONEExecute
:rubystderr
The output disturbs the display.
Cause
Vim executes Ruby like
ruby -e0. Then the0is in void context. So, Ruby warns about it.Solution
Assign 0 to
_. It suppresses the warning. And it does nothing.