Interpreted string literals in Go

Question

It's frequently nice to write long, informative strings for log messages or stderr messages. Python handles this with comma separated string literals, like:

log.warn("The operation failed on the %d iteration. "
         "Resumed on the %d iteration.",
         failed, resumed)

Go appears to have a solution for raw string literals, by using back quotes but I can't find any style guide for interpreted string literals. Am I missing something or is there no option but to use a variable? E.g.

msg := fmt.Sprintf("The operation failed on the %d iteration. ", failed)
msg += fmt.Sprintf("Resumed on the %d iteration.", resumed)
log.println(msg)

Answer 1

You could just use +:

fmt.Printf("The operation failed on the %d iteration. "+
    "Resumed on the %d iteration.",
    failed, resumed,
)

Playground.

There are examples in the standard library of using + for that, most of them in tests. Example. For more examples see this search request: http://golang.org/search?q=%22\%2B\n.