[Issue 17172] New: redundant `statement is not reachable`: should only show 1 per code block

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=17172

          Issue ID: 17172
           Summary: redundant `statement is not reachable`: should only
                    show 1 per code block
           Product: D
           Version: D2
          Hardware: x86
                OS: Mac OS X
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: timothee.cour2 at gmail.com

D20170209T222632

dmd -c -o- -w test.d:
```
void test(){
  version(linux) return;
  int a=1;
  int b=1;
}
```
test.d(1): Warning: statement is not reachable
test.d(2): Warning: statement is not reachable

Expected:
test.d(1): Warning: statement is not reachable
The 2nd warning is in the same code block so is redundant. This is annoying:

* when debugging and doing an early return as shown, it can show tons of
warnings (masking more useful ones)

* the workaround is to use:

version(none){
  // unused code
}

but it has issues:

- increases indentation

- the code is no longer checked for being compilable, and after a while becomes
out of sync.

--