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f=function(x)while(1)if(length(x))grep(x,'')
This halts if grep(x,'') receives invalid regex, which was the intended solution. Also fails when given a function as input.
grep(x,'')
f=function(x)while(tryCatch1)if(!ncharlength(x)|x|!x,error = function(e)1))grep(x,'')
f=function(x)while(tryCatch(!nchar(x)|x|!x,error = function(e)1))grep(x,'')
f=function(x)while(tryCatch(!nchar(x)|x|x|!x,error = function(e)1))grep(x,'')
f=function(x)while(tryCatch(!nchar(x)|x,error = function(e)1))grep(x,'')
