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Notice the comment in dialyzer_utils:
%% Copied from core_pp. The function cerl:binary_segments/2 should/could
%% be extended to handle literals, but then the cerl module cannot be
%% HiPE-compiled as of Erlang/OTP 22.0 (due to <<I:N>>).
When at it: simplify some common cases like "/binary-unit:8".
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This ticket is about records in Erlang code, and when to check the
fields against the (optional) types given when defining records.
Dialyzer operates on the Erlang Core format, where there are no trace
of records. The fix implemented is a Real Hack:
Given the new option 'dialyzer' erl_expand_records marks the line
number of records in a way that is undone by v3_core, which in turn
inserts annotations that can be recognized by Dialyzer.
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Dialyzer no longer outputs warnings for unused anonymous functions
("funs"). Warnings are still output for unused functions.
Funs in functions with -nowarn_unused_function attributes generated
warnings for unused functions. Unused list comprehensions also
generated warnings for unused funs.
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