[Varnish] #1510: using "first" as the name of a director in V4.0

[Varnish]

#1510: using "first" as the name of a director in V4.0
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 Reporter:  alanj    |       Type:  defect
   Status:  new      |   Priority:  normal
Milestone:           |  Component:  varnishd
  Version:  unknown  |   Severity:  normal
 Keywords:           |
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 In converting a file form V3 to v4 I my testing resulted in the error:

 /usr/local/sbin/varnishd -C -f default.vcl.410b
 Message from VCC-compiler:
 Missing errorhandling code in parse_new(), vcc_action.c line 167:
   Condition((sy1) == 0) not true.
 Running VCC-compiler failed, signal 6

 VCL compilation failed

 when compiling this was caused by a backend being called first and a
 director being called first.  Changing this to a backend called first1 and
 a director called start_first solved this issue.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1510>
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