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<p>This document describes the changes made to the Compiler
application.</p>
+<section><title>Compiler 7.1</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>For many releases, it has been legal to override a BIF
+ with a local function having the same name. However,
+ calling a local function with the same name as guard BIF
+ as filter in a list comprehension was not allowed.</p>
+ <p>
+ Own Id: OTP-13690</p>
+ </item>
+ <item>
+ <p>compile:forms/2 would not return the module name as
+ documented when one of the options '<c>from_core</c>',
+ '<c>from_asm</c>', or '<c>from_beam</c>' was given. Also,
+ the compiler would crash if one of those options was
+ combined with '<c>native</c>'.</p>
+ <p>
+ Own Id: OTP-14408 Aux Id: ERL-417 </p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>
+ Optimized test for tuples with an atom as first element.</p>
+ <p>
+ Own Id: OTP-12148</p>
+ </item>
+ <item>
+ <p>
+ Compilation of modules with huge literal binary strings
+ is now much faster.</p>
+ <p>
+ Own Id: OTP-13794</p>
+ </item>
+ <item>
+ <p>Replaced usage of deprecated symbolic <seealso
+ marker="erts:erlang#type-time_unit"><c>time
+ unit</c></seealso> representations.</p>
+ <p>
+ Own Id: OTP-13831 Aux Id: OTP-13735 </p>
+ </item>
+ <item>
+ <p>The undocumented and unsupported module
+ <c>sys_pre_expand</c> has been removed. As a partial
+ replacement for the functionality, there is a new
+ function <c>erl_internal:add_predefined_functions/1</c>
+ and <c>erl_expand_records</c> will now add a module
+ prefix to calls to BIFs and imported functions.</p>
+ <p>
+ Own Id: OTP-13856</p>
+ </item>
+ <item>
+ <p>The internal compiler passes now start all generated
+ variables with "@" to avoid any conflicts with variables
+ in languages such as Elixir or LFE.</p>
+ <p>
+ Own Id: OTP-13924</p>
+ </item>
+ <item>
+ <p>The function <c>fmod/2</c> has been added to the
+ <c>math</c> module.</p>
+ <p>
+ Own Id: OTP-14000</p>
+ </item>
+ <item>
+ <p>Code generation for complicated guards have been
+ improved.</p>
+ <p>
+ Own Id: OTP-14042</p>
+ </item>
+ <item>
+ <p>
+ The compiler has new warnings for repeated identical map
+ keys.</p>
+ <p>
+ A map expression such as,</p>
+ <p>
+ <c> #{'a' => 1, 'b' => 2, 'a' => 3}.</c></p>
+ <p>
+ will produce a warning for the repeated key 'a'.</p>
+ <p>
+ Own Id: OTP-14058</p>
+ </item>
+ <item>
+ <p>By default, there will now be a warning when
+ <c>export_all</c> is used. The warning can be disabled
+ using <c>nowarn_export_all</c>.</p>
+ <p>
+ Own Id: OTP-14071</p>
+ </item>
+ <item>
+ <p>
+ Optimize maps pattern matching by only examining the
+ common keys in each clause first instead of all keys.
+ This will reduce the number of lookups of each key in
+ maps pattern matching.</p>
+ <p>
+ Own Id: OTP-14072</p>
+ </item>
+ <item>
+ <p>There is a new '<c>deterministic</c>' option to omit
+ '<c>source</c>' and '<c>options</c>' tuples in the BEAM
+ file.</p>
+ <p>
+ Own Id: OTP-14087</p>
+ </item>
+ <item>
+ <p>
+ Analyzing modules with binary construction with huge
+ strings is now much faster. The compiler also compiles
+ such modules slightly faster.</p>
+ <p>
+ Own Id: OTP-14125 Aux Id: ERL-308 </p>
+ </item>
+ <item>
+ <p>Atoms may now contain arbitrary Unicode
+ characters.</p>
+ <p>
+ Own Id: OTP-14178</p>
+ </item>
+ <item>
+ <p><c>compile:file/2</c> now accepts the option
+ <c>extra_chunks</c> to include extra chunks in the BEAM
+ file.</p>
+ <p>
+ Own Id: OTP-14221</p>
+ </item>
+ <item>
+ <p>The format of debug information that is stored in BEAM
+ files (when <c>debug_info</c> is used) has been changed.
+ The purpose of the change is to better support other
+ BEAM-based languages such as Elixir or LFE.</p>
+ <p>All tools included in OTP (dialyzer, debugger, cover,
+ and so on) will handle both the new format and the
+ previous format. Tools that retrieve the debug
+ information using <c>beam_lib:chunk(Beam,
+ [abstract_code])</c> will continue to work with both the
+ new and old format. Tools that call
+ <c>beam_lib:chunk(Beam, ["Abst"])</c> will not work with
+ the new format.</p>
+ <p>For more information, see the description of
+ <c>debug_info</c> in the documentation for
+ <c>beam_lib</c> and the description of the
+ <c>{debug_info,{Backend,Data}}</c> option in the
+ documentation for <c>compile</c>.</p>
+ <p>
+ Own Id: OTP-14369 Aux Id: PR-1367 </p>
+ </item>
+ <item>
+ <p>In a future release, <c>erlang:get_stacktrace/0</c>
+ will probably only work when called from within a
+ '<c>try</c>' expression (otherwise it will return
+ <c>[]</c>.</p>
+ <p>To help prepare for that change, the compiler will now
+ by default warn if '<c>get_stacktrace/0</c>' is used in a
+ way that will not work in the future. Note that the
+ warning will not be issued if '<c>get_stacktrace/0</c>'
+ is used in a function that uses neither '<c>catch</c>'
+ nor '<c>try</c>' (because that could be a legal use if
+ the function is called from within a '<c>try</c>'.</p>
+ <p>
+ Own Id: OTP-14401</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
<section><title>Compiler 7.0.4</title>
<section><title>Fixed Bugs and Malfunctions</title>