pad_left
String.pad_left
pad this string at the beginning with `p` such that its `codepoint_count` is at least `n`.
Precondition
pre safety: p.codepoint_count > 0 debug: n >= 0
Postcondition
post debug: result.codepoint_count >= n debug: ((result.codepoint_count >= n+p.codepoint_count): result = String.this)
0.095dev (GIT hash 09dff08de289bbb6f7136c7e2f8c66dcc1856bba)