R Under development (unstable) (2024-10-14 r87233 ucrt) -- "Unsuffered Consequences"
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> library(qwraps2)
> 
> # expect %s% to work like a inline paste0
> astr <- "test string 1"
> bstr <- "abcd e"
> cstr <- "  zyxw."
> dstrs <- c("ONE", "TWO", "THREE")
> 
> stopifnot(astr %s% bstr %s% cstr == paste0(astr, bstr, cstr))
> stopifnot(astr %s% dstrs %s% bstr == paste0(astr, dstrs, bstr))
> 
> # expect error if using non-character
> stopifnot(class(try(astr %s% "1", silent = TRUE)) == "character")
> stopifnot(class(try(astr %s%  1,  silent = TRUE)) == "try-error")
> 
> 
> proc.time()
   user  system elapsed 
   0.20    0.09    0.29