Dig straight down like an idiot

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Dig straight down like an idiot or DSDLAI is a variant of Dig created by User:Emerald, where there is a 20% to 90% chance for the program to return an error (analogous to falling into lava when digging straight down in the popular video game Minecraft) when using the dig command.

Example

Hello, world!

>$H:e:l:l:$o:%:W:o:$r:l:d:!:@
 8        8  0     8

However, this program does not guarantee success, as there is a 20% to 90% chance of the program returning an error.

Implementations

A Python interpreter by User:Bangyen.