Others have explained why Perl complains — in case the string literal is declared with double quotes, at least. In other words, your source is apparently not encoded in UTF-8, as you're telling Perl with the pragma use utf8.
What I find more surprising is that Perl doesn't complain when - within the scope of use utf8 - the string literal (containing a Latin-1 encoded char like '°') is declared using single quotes. I'd say the latter is a bug (unless I've overlooked something in the docs... :)
(I can replicate the issue here with 5.12.2.)
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