(eplain.info)\futurenonspacelet

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7.6.9 '\futurenonspacelet'
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The '\futurelet' primitive allows you to look at the next token from the
input. Sometimes, though, you want to look ahead while ignoring any
spaces. This is what '\futurenonspacelet' does. It is otherwise the same
as '\futurelet': you give it two control sequences as arguments, and it
assigns the next nonspace token to the first, and then expands the
second. For example:

     \futurenonspacelet\temp\finishup
     \def\finishup{\ifx\temp ...}