Rework treatment of `elem`. Add UTF8 GHC.CString functions.

A fusion RULE for elem was broken preventing it from firing.
Fixing this allows a call to elem on a known list to be translated
into a series of equality checks, and eventually a simple case
expression.

This now also works for unboxed string literals via a builtin rule.

As a byproduct GHC.CString functionality is now available for Ascii
and UTF8 strings. The following missing UTF8 variants were
added: unpackAppendCStringUtf8#, unpackFoldrCStringUtf8#

They work just like their ascii counterparts. Which hopefully
makes proper UTF8 support easier for library authors and was
required to support this transformation for utf8 encoded
unboxed strings.

0 files changed, 0 insertions, 0 deletions