diff --git a/redo-sh.do b/redo-sh.do
index 0140e4d..468ddde 100644
--- a/redo-sh.do
+++ b/redo-sh.do
@@ -11,8 +11,8 @@ WARN=
 # powerful ones.  We want weaker shells to take precedence, as long as they
 # pass the tests, because weaker shells are more likely to point out when you
 # use some non-portable feature.
-for sh in dash sh /usr/xpg4/bin/sh ash posh mksh ksh ksh88 ksh93 pdksh \
-		bash zsh busybox; do
+for sh in dash /usr/xpg4/bin/sh ash posh mksh ksh ksh88 ksh93 pdksh \
+		zsh bash busybox sh; do
 	printf "%-30s" "Testing $sh..."
 	FOUND=`which $sh 2>/dev/null` || { echo "missing"; continue; }
 	
diff --git a/t/dotparams.od b/t/dotparams.od
index ab00bf4..36fa5f0 100644
--- a/t/dotparams.od
+++ b/t/dotparams.od
@@ -1,2 +1,2 @@
 # call this as ". ./dotparams.od a b" from shelltest.od
-[ "$1" = a ] && [ "$2" = b ] && [ "$#" = 2 ] || fail 115
+[ "$1" = a ] && [ "$2" = b ] && [ "$#" = 2 ] || warn 115
diff --git a/t/shelltest.od b/t/shelltest.od
index c9059c6..1014032 100644
--- a/t/shelltest.od
+++ b/t/shelltest.od
@@ -111,7 +111,10 @@ f3=$(quiet_stderr eval ': ${f3:=
 g3="
 	a
 	b"
-[ "$f3" = "$g3" ] || fail 18
+# This is kind of a major problem, but rejecting dash and busybox sh because
+# of this may cause more trouble than it's worth: people end up writing .do
+# scripts with bashisms unnecessarily :(
+[ "$f3" = "$g3" ] || warn 18
 
 
 # Note: assignment of $@ in this context is unspecified (what do you even expect
@@ -371,11 +374,20 @@ false
 . ./nothing.od || warn 114
 
 # this is actually a bash/kshism, but is allowed by POSIX: the parameters to
-# '.' should be passed to the sub-script.  Because it's so useful, let's
-# require it, even though it's not strictly required by POSIX.
+# '.' should be passed to the sub-script.
+#
+# We used to require this, because it's so useful despite being optional in POSIX.
+# But unfortunately, too many shells (including dash) can't do it, so we ended up
+# always using bash, which leads people to write .do scripts with bashisms.
 set x y z
-. ./dotparams.od a b || fail 115
+# dotparams.od might warn 115
+. ./dotparams.od a b || fail 117
 [ "$1-$2-$3" = "x-y-z" ] || fail 116
 
+# Warn about the way bash allows '==' in its test command.
+# This is the #1 bashism I've observed, and totally unnecessary, so let's
+# dock it some points so it doesn't always end up as the primary shell.
+[ 1 == 1 ] 2>/dev/null && warn 118
+
 [ -n "$FAIL" ] || exit 40
 exit $FAIL