How can I execute a statement and ignore warnings with tryCatch?

I tried the following code:

x <- NULL
tryCatch(
  x <- sqrt(-1),
  warning = function(cond) print(paste("Ignore: ", conditionMessage(cond)))
)
# [1] "Ignore:  NaNs produced"

Expected output:

# [1] "Ignore:  NaNs produced"
x
#NaN

Notice that x is still NULL. No value has been assigned.

• I tried x <<-, but that doesn't work.
• I would like to show the ignored warning, instead of just suppressing the warnings. After suppressWarnings(x <- sqrt(-1)) I do not know how to recover the warning message.

For those who do not need a full try-catch-handler but who only want to briefly "pass" execution of a single line of code in case of an error (and continue execution of the rest of code). One can use:

suppressWarnings(try(...))

try() also has the argument silent which allows to "shut up" R not only in case of a warning, but also in case of an error.

suppressWarnings(try(warning("Warning here")))

...returns no information regarding the warning.

suppressWarnings(try(stop("Errro here"), silent=TRUE))

...returns no information regarding the error.

Example:

for (x in seq(1,10)){
  print(x)
  if (x == 5){try(stop("Error here..."))}
}