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+## You need a space before the :.
+
+### Problematic code:
+
+```sh
+until make
+do:; done
+```
+
+### Correct code:
+
+```sh
+until make
+do :; done
+```
+### Rationale:
+
+ShellCheck found a keyword immediately followed by a `:`. `:` is a synonym for `true`, the command that "does nothing, successfully", and as a command name it needs a space. 
+
+`do:` is as invalid as `dotrue`. Use `do :`, or preferably, `do true` for readability.
+
+### Exceptions:
+
+None
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