Wed, 20 May 1998 18:58:13 +0200 changed get_single: ('a, 'b) source -> 'a option * ('a, 'b) source;
wenzelm [Wed, 20 May 1998 18:58:13 +0200] rev 4954
changed get_single: ('a, 'b) source -> 'a option * ('a, 'b) source; tuned prompt; Scan.source vs. Scan.source';
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