squiggly heredoc strip space between interpolation and line connector by mistake

[pbl-pw]

Environment

jruby 9.1.5.0 (2.3.1) 2016-09-23 fffffff Java HotSpot(TM) Client VM 25.51-b03 on 1.8.0_51-b16 +jit [mswin32-x86]

Test code

ext = 'Tail'
puts <<~TEST
    Line1 #{ext} \
    Line2
TEST
puts <<~TEST
    Line1 Tail \
    Line2
TEST

Expected Behavior

MRI output:

Line1 Tail  Line2
Line1 Tail  Line2

Actual Behavior

jruby output:

Line1 TailLine2
Line1 Tail  Line2