[perl #93988] [BUG] LTA error for number ending in a dot in Rakudo

[Christian Bartolomaeus via RT]

Current behaviour:

$ ./viv -c -e '5.'
===SORRY!===
Decimal point must be followed by digit at (eval) line 1:
------> 5.⏏<EOL>
Unsupported use of . to concatenate strings; in Perl 6 please use ~ at (eval) 
line 1 (EOF):
------> 5.⏏<EOL>
Parse failed

$ perl6 -e '5. '   ## note the whitespace after the dot
===SORRY!===
Decimal point must be followed by digit
at -e:1
------> 5.⏏ 
Unsupported use of . to concatenate strings; in Perl 6 please use ~
at -e:1
------> 5. ⏏<EOL>

So far so good. There is still a problem when there is no whitespace after the 
dot:

$ perl6 -e '5.'
===SORRY!=== Error while compiling -e
Missing semicolon.
at -e:1
------> 5.⏏<EOL>

Adding a semicolon looks gives one good and and strange error message:

$ ./perl6-m -e '5.;'
===SORRY!===
Decimal point must be followed by digit
at -e:1
------> 5.⏏;
Missing semicolon.
at -e:1
------> 5.⏏;