Take a chance that I'm correct:

scrappy · scrappy · commit aeb6656433e1 · 1996-08-26T06:53:03.000Z
attno is used in an if statement, yet isn't defined, nor used
anywhere else (~line 945)
diff --git a/src/backend/commands/copy.c b/src/backend/commands/copy.c
@@ -6,7 +6,7 @@
  *
  *
  * IDENTIFICATION
- *    $Header: /cvsroot/pgsql/src/backend/commands/copy.c,v 1.2.2.1 1996/08/24 20:53:39 scrappy Exp $
+ *    $Header: /cvsroot/pgsql/src/backend/commands/copy.c,v 1.2.2.2 1996/08/26 06:53:03 scrappy Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -742,7 +742,7 @@ CopyReadAttribute(FILE *fp, bool *isnull, char *delim)
 	if (feof(fp)) {
 	    *isnull = (bool) false;
 	    return(NULL);
-	}else if (reading_from_input && attno == 0 && i == 0 && c == '.') {
+	}else if (reading_from_input && i == 0 && c == '.') {
 	    attribute[0] = c;
 	    c = getc(fp);
 	    if (c == '\n') {

Original file line number	Diff line number	Diff line change
`@@ -6,7 +6,7 @@`
`6`	`6`	`*`
`7`	`7`	`*`
`8`	`8`	`* IDENTIFICATION`
`9`		`- * $Header: /cvsroot/pgsql/src/backend/commands/copy.c,v 1.2.2.1 1996/08/24 20:53:39 scrappy Exp $`
	`9`	`+ * $Header: /cvsroot/pgsql/src/backend/commands/copy.c,v 1.2.2.2 1996/08/26 06:53:03 scrappy Exp $`
`10`	`10`	`*`
`11`	`11`	`*-------------------------------------------------------------------------`
`12`	`12`	`*/`
`@@ -742,7 +742,7 @@ CopyReadAttribute(FILE fp, bool isnull, char *delim)`
`742`	`742`	`if (feof(fp)) {`
`743`	`743`	`*isnull = (bool) false;`
`744`	`744`	`return(NULL);`
`745`		`- }else if (reading_from_input && attno == 0 && i == 0 && c == '.') {`
	`745`	`+ }else if (reading_from_input && i == 0 && c == '.') {`
`746`	`746`	`attribute[0] = c;`
`747`	`747`	`c = getc(fp);`
`748`	`748`	`if (c == '\n') {`