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By default Dialyzer tries to improve the readability of warnings.
Newlines are inserted before and inside types, signatures, and Erlang
code. Sometimes the newlines look misplaced. The raw format
(option --raw) is not affected.
Use the new --no_indentation option get the old behavior (no inserted
line breaks).
A note on the implementation. The types &c present in the warning
tuples are parsed, and then formatted using erl_pp, the Erlang Pretty
Printer. The alternative, to create message tuples with formatted
types, turned out to more complicated, and has no real benefits.
Also notice that the fixes for binaries (commit 9db8a098) and union
elements (commit a1e51d12) are required. As a consequence, messages
created before these commits using the --raw option cannot always be
indented.
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Warnings about clauses that cannot match and are also compiler generated
are suppressed unless none of the clauses return.
This feature is useful for non-Erlang BEAM languages (such as Elixir)
that compile to Erlang and expand certain language constructs into case
statements. In that case, as long as the language construct can succeed,
these warnings are undesired and appear spurious to users that do not
check the Erlang code that their program expands into.
Thanks to José Valim for the test (slightly modified).
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*_SUITE.erl files are now automatically generated by the respective data
directories by the Makefile.
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Generation of the PLT is now performed without using OS commands.
We still try to copy in the default plt to make small scale testing
efficient. If generation/checking fails, suites are skipped except
plt_tests_SUITE which contains a bare PLT check that fails normally.
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