Description of problem:
Package perl-Syntax-Feature-Loop fails to build from source in Fedora Rawhide.

Bareword found where operator expected at t/01_basic.t line 20, near "loop"
	(Missing semicolon on previous line?)
syntax error at t/01_basic.t line 19, near "; last "
Global symbol "$s" requires explicit package name (did you forget to declare "my $s"?) at t/01_basic.t line 20.
Global symbol "$i" requires explicit package name (did you forget to declare "my $i"?) at t/01_basic.t line 20.
Global symbol "$s" requires explicit package name (did you forget to declare "my $s"?) at t/01_basic.t line 20.
Global symbol "$s" requires explicit package name (did you forget to declare "my $s"?) at t/01_basic.t line 21.
syntax error at t/01_basic.t line 22, near "}"
Can't redeclare "my" in "my" at t/01_basic.t line 26, near "my"
syntax error at t/01_basic.t line 28, near "last if"
syntax error at t/01_basic.t line 36, near "}"
syntax error at t/01_basic.t line 38, near "}"
t/01_basic.t has too many errors.
# Looks like your test exited with 2 before it could output anything.
t/01_basic.t ............ 
Dubious, test returned 2 (wstat 512, 0x200)
Failed 4/4 subtests 
Bareword found where operator expected at t/02_pragma_a.t line 28, near "is"
	(Missing semicolon on previous line?)
syntax error at t/02_pragma_a.t line 27, near "; last"
BEGIN not safe after errors--compilation aborted at t/02_pragma_a.t line 31.
# Looks like your test exited with 2 before it could output anything.
t/02_pragma_a.t ......... 
Dubious, test returned 2 (wstat 512, 0x200)
Failed 6/6 subtests 
Bareword found where operator expected at t/02_pragma_b.t line 28, near "is"
	(Missing semicolon on previous line?)
syntax error at t/02_pragma_b.t line 27, near "; last"
BEGIN not safe after errors--compilation aborted at t/02_pragma_b.t line 31.
# Looks like your test exited with 2 before it could output anything.
t/02_pragma_b.t ......... 
Dubious, test returned 2 (wstat 512, 0x200)
Failed 6/6 subtests 
Semicolon seems to be missing at t/03_line_numbers.t line 112.
syntax error at t/03_line_numbers.t line 102, near "is"
syntax error at t/03_line_numbers.t line 112, near "}"
Execution of t/03_line_numbers.t aborted due to compilation errors.
# Looks like your test exited with 255 before it could output anything.
t/03_line_numbers.t ..... 
Dubious, test returned 255 (wstat 65280, 0xff00)
Failed 5/5 subtests 


A difference between passing and failing build root is at https://koschei.fedoraproject.org/build/15176950. An update of perl-Lexical-Var from 0.009-31.fc38 to 0.010-1.fc39 is suspicious.

Additional info:
This package is tracked by Koschei. See:
https://koschei.fedoraproject.org/package/perl-Syntax-Feature-Loop