perl - 关于编译时错误的问题

Question

#!/usr/bin/env perl
use warnings;
use 5.012;

say "no semicolon"

say "World";
say "World";
say "World";
say "World";
say "World";

# syntax error at ./perl1.pl line 7, near "say"
# Execution of ./perl1.pl aborted due to compilation errors.

.

#!/usr/bin/env perl
use warnings;
use 5.012;

my $character = "\x{ffff}";

say "Hello";
say "Hello";
say "Hello";
say "Hello";
say "Hello";

# Unicode non-character 0xffff is illegal for interchange at ./perl1.pl line 5.
# Hello
# Hello
# Hello
# Hello
# Hello

为什么第二个脚本没有告诉我存在编译时错误？

当我不能时 - 使用“使用警告 FATAL => qw(all);” - 使用 Try::Tiny 或 block-eval 捕获错误，我可以得出结论，这是一个编译时错误吗？

#!/usr/bin/env perl
use warnings FATAL => qw(all);
use 5.012;
use Try::Tiny;

my $character;

try {
    $character = "\x{ffff}";
} catch {
    die "---------- caught error ----------\n";
};

say "something";

# Unicode non-character 0xffff is illegal for interchange at ./perl1.pl line 9.

Answer 1

Unicode 非字符 0xffff is illegal for interchange at ... 是编译时警告。

当您使用警告 FATAL => all 时，您要求 Perl 将所有警告视为错误，因此它变成了编译时错误。