upgrading to v4, change of "req.backend.healthy" -> "std.healthy(req.backend)" reports "Symbol not found: 'std.healthy' (expected type BOOL)"

[grantksupport]

Digging around, guess this IS a separate issue.

According to

        "req.backend.healthy replaced by std.healthy(req.backend)"

I changed in my vcl

                ...
        -           if (req.backend.healthy) {
223     +           if (std.healthy(req.backend)) {
                        set req.grace = 30s;
                    } else {
                        set req.grace = 1h;
                    }  
                ...


but config check reports

        Message from VCC-compiler:
        Symbol not found: 'std.healthy' (expected type BOOL):
        ('input' Line 223 Pos 13)
                if (std.healthy(req.backend)) {
        ------------###########----------------

        Running VCC-compiler failed, exit 1

        VCL compilation failed

I found the original commit @

 "[master] 351e100 Add BOOL std.healthy(BACKEND) which can check if any
 backend is healthy, rather than have hardcoded variables for
 req.backend and bereq.backend's health"
  
https://www.varnish-cache.org/lists/pipermail/varnish-commit/2013-November/010284.html

and a question about usage @

 "Questiona about req.backend.healthy"
  
https://www.varnish-cache.org/lists/pipermail/varnish-misc/2013-June/023139.html

but don't understand the problem.

Grant

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