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$ perl -e '$a=inf; print ++$a,"\n"'
ing
...
$ perl -v

This is perl 5, version 14, subversion 2 (v5.14.2) built for darwin-th
+read-multi-2level

$ perl -Mwarnings -e '$a=inf; print ++$a,"\n"'
Unquoted string "inf" may clash with future reserved word at -e line 1
+.
...
$ perl -Mstrict -e '$a=inf; print ++$a,"\n"'
Bareword "inf" not allowed while "strict subs" in use at -e line 1.
Execution of -e aborted due to compilation errors.