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plpgsql EXIT construct forgot to downcase or quote-strip its identifier

argument, leading to label matching failures at run-time. Per report fromPatrick Fiche. Also, fix it so that an unrecognized label argument drawsa more useful error message than 'syntax error'.

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src/pl/plpgsql/src
- gram.y

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`‎src/pl/plpgsql/src/gram.y‎`

Lines changed: 13 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -4,7 +4,7 @@`
`4`	`4`	`* procedural language`
`5`	`5`	`*`
`6`	`6`	`* IDENTIFICATION`
`7`		`- * $PostgreSQL: pgsql/src/pl/plpgsql/src/gram.y,v 1.62 2004/09/14 23:46:46 neilc Exp $`
	`7`	`+ * $PostgreSQL: pgsql/src/pl/plpgsql/src/gram.y,v 1.63 2004/10/12 15:44:15 tgl Exp $`
`8`	`8`	`*`
`9`	`9`	`* This software is copyrighted by Jan Wieck - Hamburg.`
`10`	`10`	`*`
`@@ -1639,7 +1639,18 @@ opt_label:`
`1639`	`1639`	`opt_exitlabel:`
`1640`	`1640`	`{$$ =NULL; }`
`1641`	`1641`	`\|T_LABEL`
`1642`		`-{$$ = strdup(yytext); }`
	`1642`	`+{`
	`1643`	`+char*name;`
	`1644`	`+`
	`1645`	`+plpgsql_convert_ident(yytext, &name,1);`
	`1646`	`+$$ = strdup(name);`
	`1647`	`+pfree(name);`
	`1648`	`+}`
	`1649`	`+\|T_WORD`
	`1650`	`+{`
	`1651`	`+/* just to give a better error than "syntax error"*/`
	`1652`	`+yyerror("no such label");`
	`1653`	`+}`
`1643`	`1654`	`;`
`1644`	`1655`
`1645`	`1656`	`opt_exitcond:';'`

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`‎src/pl/plpgsql/src/gram.y‎`

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