diff --git a/runtime/syntax/testdir/dumps/sh_10_00.dump b/runtime/syntax/testdir/dumps/sh_10_00.dump
new file mode 100644
index 0000000..b0c98ea
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/sh_10_00.dump
@@ -0,0 +1,20 @@
+>#+0#0000e05#ffffff0|!|/|b|i|n|/|k|s|h| +0#0000000&@64
+@75
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diff --git a/runtime/syntax/testdir/dumps/sh_10_01.dump b/runtime/syntax/testdir/dumps/sh_10_01.dump
new file mode 100644
index 0000000..c1d3531
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/sh_10_01.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/sh_10_02.dump b/runtime/syntax/testdir/dumps/sh_10_02.dump
new file mode 100644
index 0000000..e03c3f8
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/sh_10_02.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/sh_10_99.dump b/runtime/syntax/testdir/dumps/sh_10_99.dump
new file mode 100644
index 0000000..f97ea32
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/sh_10_99.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/input/sh_10.sh b/runtime/syntax/testdir/input/sh_10.sh
new file mode 100644
index 0000000..be463c3
--- /dev/null
+++ b/runtime/syntax/testdir/input/sh_10.sh
@@ -0,0 +1,49 @@
+#!/bin/ksh
+
+# This script is a test file for ksh93 shared-state
+# command substitutions (subshares) and mksh value
+# substitutions (valsubs).
+
+# ======
+# Below is subshare syntax supported by both ksh93 and mksh.
+print ${ echo one }
+print ${	echo two
+}
+print ${
+echo three	}
+print ${ echo 'four'; }
+print ${ echo 'five' ;}
+print ${ echo 'six'
+}
+print ${	echo 'seven'	}
+echo ${ print 'eight'	}
+typeset nine=${ pwd; }
+
+# ======
+# Value substitutions of the form ${|command} are only
+# supported by mksh, not ksh93.
+if ! command eval '((.sh.version >= 20070703))' 2>/dev/null; then
+	valsubfunc() {
+		REPLY=$1
+	}
+	echo ${|valsubfunc ten}
+	print "${|valsubfunc eleven;}"
+	printf '%s' "${|valsubfunc twelve	}"
+	unlucky=${|valsubfunc thirteen
+}
+	typeset notafloat=${|valsubfunc notanumber	}
+	print $unlucky $notanumber
+	${|echo foo}
+	${|echo bar
+}
+fi
+
+# ======
+# Shared-state command substitutions using the syntax ${<file;}
+# are only supported by ksh93, not mksh.
+echo ${
+	printf %s str
+} > /tmp/strfile
+echo ${</tmp/strfile;}
+
+exit 0