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use v5.20;

BEGIN { require v5.20; }
no feature qw( :all );      # `use v5.10;`+
use feature qw( :5.20 );    # `use v5.10;`+
use strict;                 # `use v5.12;`+
#use warnings;              # `use v5.35;`+

require v5.20;
feature->unimport::out_of( $caller, ':all' );  # `use v5.10;`+
feature->import::into( $caller, ':5.20' );     # `use v5.10;`+
strict->import::into( $caller );               # `use v5.12;`+
#warnings->import::into( $caller );            # `use v5.35;`+

$ perl -e'use v5.35; abc def;'
Bareword found where operator expected (Do you need to predeclare "abc
+"?) at -e line 1, near "abc def"
...
Bareword found where operator expected (Do you need to predeclare "abc
+"?) at -e line 1, near "abc def"
syntax error at -e line 1, near "abc def"
Execution of -e aborted due to compilation errors.