[m-rev.] diff: fix hlc grade recompilation test failures

[Simon Taylor]

Estimated hours taken: 0.2

tests/recompilation/test_functions:
	In `.hl*' grades, the compiler sometimes puts an extra line in
	the `.err' file ("foo.h has CHANGED"). Filter it out before
	comparing the `.err' file with the expected output.

Index: test_functions
===================================================================
RCS file: /home/mercury1/repository/tests/recompilation/test_functions,v
retrieving revision 1.1
diff -u -u -r1.1 test_functions
--- test_functions	2001/06/27 05:05:17	1.1
+++ test_functions	2001/06/29 07:54:19
@@ -172,6 +172,11 @@
 	module=$1
 	error_file_version=$2	
 
+	# In `.hl*' grades, the compiler sometimes puts extra lines in
+	# the `.err' file (foo.h has CHANGED). Filter them out here.
+	grep -v "has CHANGED" $module.err > $module.err2
+	mv $module.err2 $module.err
+
 	compare_files $module.err_exp.$error_file_version $module.err
 }
 
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