hush: fix some TODOs. TODO in export builting: +250 bytes.

 simplify unexpected EOF handling.

function                                             old     new   delta
builtin_export                                       117     374    +257
o_reset_to_empty_unquoted                              -      21     +21
parse_stream                                        1926    1929      +3
syntax_error_unterm_ch                                31      32      +1
handle_dollar                                        644     641      -3
parse_stream_dquoted                                 307     298      -9
add_till_backquote                                   106      97      -9
add_till_closing_paren                               303     286     -17
o_reset                                               21       -     -21
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 3/4 up/down: 282/-59)           Total: 223 bytes

2 files changed, 13 insertions, 0 deletions

diff --git a/shell/hush_test/hush-misc/export.right b/shell/hush_test/hush-misc/export.right
new file mode 100644
index 000000000..4df2e3858
--- /dev/null
+++ b/shell/hush_test/hush-misc/export.right
@@ -0,0 +1,6 @@
+export aaa1="'''"
+export aaa2=
+export aaa3="'''"'abc'
+export aaa4='def'"'''"
+export aaa5="'''"'abc'"'''"'def'"'''"
+Done
diff --git a/shell/hush_test/hush-misc/export.tests b/shell/hush_test/hush-misc/export.tests
new file mode 100755
index 000000000..87a27ecce
--- /dev/null
+++ b/shell/hush_test/hush-misc/export.tests
@@ -0,0 +1,7 @@
+export aaa1="'''"
+export aaa2=""
+export aaa3="'''abc"
+export aaa4="def'''"
+export aaa5="'''abc'''def'''"
+export | grep aaa.=
+echo Done