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4.7.3.6 Computed Comment Constructors Norm / rule 1 fs:item fs:item-sequence-to-untypedAtomic-comment( [[ Expr ]]_Expr ) This function takes a single argument (of type item*), but [[ Expr ]]_Expr could result in a sequence of comma-separated ExprSingles, which would then constitute multiple args. Put [[ Expr ]]_Expr in parentheses to ensure a single arg.
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