complete the skeleton of dquotes.subx

Still some failing tests:
  - emit-string-literal-data doesn't ignore metadata when computing the
    length of literal strings
  - emit-string-literal-data doesn't handle escape sequences

One issue doesn't have a failing test:
  - emit-metadata doesn't handle string literals containing '/'

All these open issues involve a common design question: how to parse a
'word' that includes a string literal that may include spaces.

For everything else I know words can't contain spaces and datums can't
contain slashes. But for string literals things are tougher.

1 files changed, 0 insertions, 0 deletions

diff --git a/subx/apps/pack b/subx/apps/pack
index f2149b59..1c76d927 100755
--- a/subx/apps/pack
+++ b/subx/apps/pack
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