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-rw-r--r--gcc/testsuite/g++.dg/parse/crash25.C10
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diff --git a/gcc/testsuite/g++.dg/parse/crash25.C b/gcc/testsuite/g++.dg/parse/crash25.C
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+++ b/gcc/testsuite/g++.dg/parse/crash25.C
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+// PR c++/20536
+// Found by Wolfgang Wieser 03/2005.
+// { dg-do compile }
+
+struct yyguts_t
+{
+ class TestScanner* yyextra_r; // { dg-error "forward declaration" }
+};
+
+TestScanner::TestScanner() {} // { dg-error "invalid use" }