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    Please provide code we can compile to reproduce the error and tell us the exact text of the error message. But it looks as if you are trying to redefine a command in terms of itself. An environment's contents being italic will not cause text outside that environment to be italic unless you are doing something-wrong-we-know-not-what. But it is hard to help without a minimal example. Commented Mar 25, 2017 at 2:15
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    If you have an environment called example, you cannot also have a command \example because an environment already defines a command by the same name. But the redefinition you show makes no sense anyway. Why would you not use \begin{example} whatever \end{example}? There is nothing to be gained from the proposed command that would in any way affect italicisation. Commented Mar 25, 2017 at 2:17
  • Just simply because typing the whole thing is kind of slow...and not conforming to my other environment format. Commented Mar 25, 2017 at 2:42
  • What does that have to do with italics? If you want a shortcut - not really to be recommended especially, but sometimes useful - just pick a different name. Commented Mar 25, 2017 at 2:44
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    @Shiyue: This lazyness will bite you in the end. Rather keep the usual \begin{example}...\end{example}. Commented Mar 25, 2017 at 13:00