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-rw-r--r--debian/patches/man-arithmetic.diff14
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diff --git a/debian/patches/man-arithmetic.diff b/debian/patches/man-arithmetic.diff
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+++ b/debian/patches/man-arithmetic.diff
@@ -0,0 +1,14 @@
+# DP: document deprecated syntax for arithmetic evaluation.
+
+--- a/doc/bash.1
++++ b/doc/bash.1
+@@ -3580,6 +3580,9 @@ and the substitution of the result. The
+ \fB$((\fP\fIexpression\fP\fB))\fP
+ .RE
+ .PP
++The old format \fB$[\fP\fIexpression\fP\fB]\fP is deprecated and will
++be removed in upcoming versions of bash.
++.PP
+ The
+ .I expression
+ undergoes the same expansions