Commit a657543c authored by
PrelRules: Ensure that string unpack/append rule fires with source notes
Previously the presence of source notes could hide nested applications of `unpackFoldrCString#` from our constant folding logic. For instance, consider the expression: ```haskell unpackFoldrCString# "foo" c (unpackFoldrCString# "baz" c n) ``` Specifically, ticks appearing in two places can defeat the rule: a. Surrounding the inner application of `unpackFoldrCString#` b. Surrounding the fold function, `c` The latter caused the `str_rules` testcase to fail when `base` was built with `-g3`. Fixes #16740.
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