last will exit the inner-most loop statement. Those are:

• BLOCK
• while (EXPR) BLOCK (or until)
• for (LIST) BLOCK (or foreach)
• for (EXPR..EXPR) BLOCK (or foreach)
• for (EXPR; EXPR; EXPR) BLOCK (or foreach)

Expressions with loop statement modifiers are not considered by last. The same goes for loop-like functions. These include the following:

• EXPR while EXPR; (or until): Expression with statement modifier. (Not a loop statement.)
• EXPR for LIST; (or foreach): Expression with statement modifier. (Not a loop statement.) last actually does see this as a loop to end.
• grep BLOCK LIST: Not a statement.
• map BLOCK LIST: Not a statement.

All loop statements have braces, but not all braces are related to loop statements. The following are examples that aren't:

• if (EXPR) BLOCK (or unless): Not a loop.
• grep BLOCK LIST: Not a statement.
• map BLOCK LIST: Not a statement.
• do BLOCK: Not a loop or a statement.
• eval BLOCK: Not a loop or a statement.
• sub BLOCK: Not a loop or a statement.
• sub NAME [...] BLOCK: Not a loop.

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If you want a warning for the code you used, take a look at perlcritic. If it doesn't yet have a rule for it, you could create one.

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