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sub foo { $_[0] + 1 }

Always unpack @_ first at line 22, column 1.  See page 178 of PBP.  (S
+everity: 4)
Subroutine "foo" does not end with "return" at line 22, column 1.  See
+ page 197 of PBP.  (Severity: 4)

use Function::Parameters;
fun foo ($x) {
    $x + 1
}

use Function::Parameters;
use Types::Standard qw( Num );
...
fun foo (Num $x) {
    $x + 1
}

mmap(NULL, 192512, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1
+, 0) = 0x7fe772fdf000
mremap(0x7fe771772000, 532480, 536576, MREMAP_MAYMOVE) = 0x7fe77177200
+0
...
brk(0x4a2f000)                          = 0x4a2f000
mremap(0x7fe771772000, 540672, 544768, MREMAP_MAYMOVE) = 0x7fe77177200
+0
...