Rule S3923: All branches in a conditional structure should not have exactly the same implementation

[fmallet]

#153 has been fixed but looks like RSPEC-3923 has not been added while fixing RSPEC-1871
common rule

[fmallet]

Ping, this rule allows to find highly relevant issues.

[valhristov]

We will implement all common rules in a subsequent sprint (both VB.NET and C#). 7.1 is focused only on fixing rules.

[fmallet]

Let me give a new try @valhristov : this rule is highly valuable and comes almost for free so could we consider to implement it ? :)

[Evangelink]

@fmallet Happy? :)