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Here in short whats going on. The colon is defined as \active@prefix :\active@char:. This definition is so that under certain conditions (e.g. in a protected@write, or when \if@safe@actives is true (which is the case in \@newl@bel)) the : expands to something that it "safe" in a label. But in your example : no longer has this safe definition as listings ...



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