Bug #20572: Compilation hangs with nested until

• Status: Closed
• Assignee: -
• Target version: -
• Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN

[kddnewton (Kevin Newton)]

until while 1
end
end

this code causes an infinite loop in the compiler.

[nobu (Nobuyoshi Nakada)]

Since ruby --dump=i,-opt -e 'until while 1; end; end' finishes immediately, it is a bug of optimization.

[kddnewton (Kevin Newton)]

This is another example, I imagine because of the same source problem. It also works if you disable optimizations:

_ = _ rescue while 1
end

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset git|32a555ea532fb15721ad403e6dce0a2ffc346f12.

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[Bug #20572] Abandon if replacing destination is the same