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Below are the changes for the current release.
See the CHANGES file for changes in older releases.
See the RELEASENOTES file for a summary of changes in each release.
Issue # numbers mentioned below can be found on Github. For more details, add
the issue number to the end of the URL: https://github.com/swig/swig/issues/
Version 4.2.0 (in progress)
===========================
2023-08-02: wsfulton
https://sourceforge.net/p/swig/bugs/932/
Fix missing constructor generation due to abstract class test
failure when a method is declared in the class along with a
using declaration and the using declaration is declared before
the method that implemented the pure virtual method, such as:
struct ConcreteDerived : AbstractBase {
ConcreteDerived() {} // was not wrapped
using AbstractBase::f;
virtual void f(int n) override {}
};
2023-08-02: olly
[PHP] Implement overloading between different integer types and
between double and float.
2023-07-29: wsfulton
https://sourceforge.net/p/swig/bugs/678/
Fix %copyctor used on class hierarchies with non-const copy
constructors. Previously SWIG always attempted to call a copy
constructor taking a const reference parameter instead of a
non-const reference parameter.
2023-07-28: wsfulton
#2541 Fix overloading of templated constructors and %copyctor.
2023-07-21: wsfulton
Don't generate a default constructor wrapper when a class has a
templated constructor, as there isn't actually an implied default
constructor. For example:
struct TConstructor3 {
template<typename T> TConstructor3(T val) {}
};
Previously wrappers were generated for a non-existent default
constructor which failed to compile.
2023-07-15: wsfulton
C++11 using declarations for inheriting constructors has now been
extended to support the directors feature.
2023-07-13: wsfulton
C++11 using declarations for inheriting constructors support now
also includes inheriting implicitly defined default constructors
from the base class.
2023-07-04: wsfulton
#2641 Add support for C++11 using declarations for inheriting
constructors.
2023-06-30: wsfulton
#2640 Fix syntax error parsing an expression which calls a function
with no parameters within additional brackets.
2023-06-27: mmomtchev
[Javascript] #2545 New Javascript generator targeting the Node.js
binary stable ABI Node-API.
2023-06-27: olly
[Java] Completely remove pragmas which were deprecated in 2002 and
have triggered an error since SWIG 2.0:
moduleimport Use the moduleimports pragma
moduleinterface Use the moduleinterfaces pragma
modulemethodmodifiers Use %javamethodmodifiers
allshadowimport Use %typemap(javaimports)
allshadowcode Use %typemap(javacode)
allshadowbase Use %typemap(javabase)
allshadowinterface Use %typemap(javainterfaces)
allshadowclassmodifiers Use %typemap(javaclassmodifiers)
shadowcode Use %typemap(javacode)
shadowimport Use %typemap(javaimports)
shadowbase Use %typemap(javabase)
shadowinterface Use %typemap(javainterfaces)
shadowclassmodifiers Use %typemap(javaclassmodifiers)
2023-06-24: wsfulton
#2616 Fix directors and allprotected mode and using declarations.
Previously SWIG either seg faulted or generated code that did not
compile.
2023-06-20: olly
#2486 Fix handling of template in array size, which was being
rejected by SWIG because the type string contains '<' not followed
by '('. Drop this check as it should be unnecessary now since the
fixes for #1036 ensure that template parameters are enclosed within
'<(' and ')>'.
2023-06-16: olly
[Java] Remove deprecated command line options which have done
nothing except emit a deprecation message since 2002 or before:
-jnic / -jnicpp JNI calling convention now automatic.
-nofinalize Use javafinalize typemap instead.
-proxy / -shadow Now on by default.
2023-06-16: olly
[Guile] Drop support for -Linkage ltdlmod which was only useful
for Guile <= 1.4 which we no longer support.
2023-06-15: olly
[Guile] The -gh and -scm command line options have been removed.
These have done nothing except emit a message since 2013 when
SWIG dropped support for generating bindings which used GH.
2023-06-15: olly
Remove pointer.i from the SWIG library. It's been a dummy file
which has done nothing except %echo a deprecation message since
2002. The replacement is cpointer.i.
2023-06-15: olly
SWIG will no longer fall back to using the include path to find the
input file, which has been deprecated and emitted a warning since
SWIG 1.3.37 (2009-01-13). This makes the behaviour of SWIG the
same as C/C++ compilers and works with ccache.
2023-06-15: olly
Remove features deprecated in SWIG 1.x. Most of these have
emitted a deprecation warning or error for well over a decade and
have replacements with fewer shortcomings so we expect users will
have migrated away from them long ago, but in case you need
them replacements are noted below:
%addmethods Use %extend instead.
%disabledoc Use Doxygen support instead.
%doconly Use Doxygen support instead.
%enabledoc Use Doxygen support instead.
%except Use %exception instead.
%extern Use %import instead.
%localstyle Use Doxygen support instead.
%name Use %rename instead.
%new Use %newobject instead.
%out %apply OUTPUT typemap rule instead.
%readonly Use %immutable instead.
%readwrite Use %mutable instead.
%section Use Doxygen support instead.
%style Use Doxygen support instead.
%subsection Use Doxygen support instead.
%subsubsection Use Doxygen support instead.
%text Use Doxygen support instead.
%title Use Doxygen support instead.
%typemap(except) Use %exception instead.
%typemap(ignore) Use %typemap(in,numinputs=0) instead.
%val Use typemaps instead.
-debug_template Use -debug-template instead.
-debug_typemap Use -debug-typemap instead.
-dump_classes Use -debug-classes instead.
-dump_memory Use -debug-memory instead.
-dump_module Use -debug-module 4 instead.
-dump_parse_module Use -debug-module 1 instead.
-dump_parse_top Use -debug-top 1 instead.
-dump_tags Use -debug-tags instead.
-dump_top Use -debug-top 4 instead.
-dump_tree Use -debug-top 4 instead.
-dump_typedef Use -debug-typedef instead.
-dump_xml Use -xmlout /dev/stdout instead.
-make_default On by default since SWIG 1.3.7 (2001-09-03).
-makedefault On by default since SWIG 1.3.7 (2001-09-03).
-no_default Use %nodefaultctor/%nodedefaultdtor instead.
-nodefault Use %nodefaultctor/%nodedefaultdtor instead.
-noextern option On by default since SWIG 1.3.26 (2005-10-09).
-noruntime Type sharing happens via target lang global.
-runtime Type sharing happens via target lang global.
-show_templates Use -debug-template instead.
-tm_debug Use -debug-typemap instead.
-xml out.xml Use -xml -o out.xml instead.
BOTH typemap rule Use INOUT typemap rule instead.
2023-06-15: olly
[Guile] Fix freearg typemaps to go with char **INOUT and char
*INOUT in typemaps. Previously the char **INOUT typemap would
leak memory if must_free$argnum was true, and the char *INOUT
typemap would generate code that didn't compile.
2023-06-07: olly
#2630 Fix preprocessor handling of a slash immediately followed by
a single quote, which wasn't getting recognised as starting a
character literal.
2023-06-07: olly
#2630 Fix parsing of <= and >= in templated lambda.
Skipping between matching delimiters is now done at the token level
rather than the character level.
2023-06-02: mmomtchev
[Javascript] #2622 Fix support for %typemap(default) and improve
support for default arguments in general.
2023-06-01: olly
[Perl] #2470 Fix some integer truncation warnings in generated
wrappers.
2023-05-30: olly
[Lua] Fix bug when passing a Lua number to a C++ function expected
std::string. Order of evaluation of C++ function arguments is not
defined, and if lua_rawlen() was called before lua_tostring() then
it would return 0 (because the value was still a number) and an
empty string would be passed.
2023-05-30: mmomtchev
[Javascript] #2618 Fix handling of C++ pointer to member function.
2023-05-25: olly
#1032 Allow typename disambiguator in:
using typename NodeT::links_type;
2023-05-25: olly
SWIG now discriminates between long double, double and float
constants. For example, this means that for target languages which
support a separate float type (such as C# and D) this will now
create a float constant instead of a double constant in the target
language:
#define PI_ISH 3.1414f
2023-05-25: olly
C++11 `auto` variables and `decltype()` can now deduce the
type of some expressions which involve literals of built-in types.
Currently int is not supported due to the parser misusing T_INT
for situations where the type isn't actually known.
2023-05-25: olly
#1125 Support parsing C++11 auto variables. This uses the
existing type deduction code from decltype so has the same
limitations, and such variables will only actually be wrapped
when SWIG can deduce the type.
2023-05-23: olly
[Ruby] Fix deprecation warnings about ANYARGS when compiling
C++ code for SWIG-generated Ruby wrappers with Ruby 3.x.
This is a recurrence of a problem fixed in 4.0.2. Our fix was
conditional on RB_METHOD_DEFINITION_DECL being defined, but Ruby
3.0 stopped defining this.
2023-05-23: olly
#2606 Improve error output when SWIG reaches EOF while looking for
a closing delimiter. This is reported with an error like:
Error: Missing '}'. Reached end of input.
We now exit after reporting this and so no longer report a second
more generic error like:
Error: Syntax error in input(1).
2023-05-22: mmomtchev
[Javascript] #2600 Improve test coverage by adding _runme.js files
for 22 test cases.
2023-05-20: erezgeva
[C#, D, Java, Javascript, Guile, Scilab] #2552 Implement argcargv.i
library multi-argument typemaps.
2023-05-20: erezgeva
[D] #56 #2538 #2570 The generated code now works with recent D releases:
adds override keyword on overridden methods.
Support is now working using DMD, gcc D and LLVM D compilers.
2023-05-20: olly
Support deducing the type for decltype(false) and
decltype(true).
2023-05-19: olly
#2446 Add support for auto without trailing return type, which is a
C++14 feature.
2023-05-19: olly
SWIG no longer defines preprocessor symbols corresponding to
command line options (e.g. `-module blah` was resulting in
`SWIGOPT_MODULE` being set to `blah`). This feature was added in
2001 so that "[m]odules can look for these symbols to alter their
code generation if needed", but it's never been used for that
purpose in over 20 years, and has never been documented outside of
CHANGES.
2023-05-18: olly
SWIG now defines __STDC__ to 1 to match the behaviour of ISO C/C++
compilers, rather than to have an empty value.
*** POTENTIAL INCOMPATIBILITY ***
2023-05-18: olly
#2591 The value of __cplusplus SWIG defines can now be overridden
on the command line, e.g. using -D__cplusplus=201103L which is
useful if you're wrapping headers which have preprocessor checks
based on its value. By default SWIG now defines __cplusplus to
199711L (the value for C++98) rather than setting its value to
be __cplusplus.
*** POTENTIAL INCOMPATIBILITY ***
2023-05-18: olly
#2591 Add new -U command line option to undefine a preprocessor
symbol.
2023-05-18: olly
#1589 #2335 Support parsing arbitrary expression in decltype.
Use parser error recovery to skip to the closing matching `)` and
issue a warning that we can't deduce the decltype for the
expression (like we already do for any expression which isn't a
simple variable or similar).
2023-05-12: mmomtchev, erezgeva
[Javascript] #2561 Support check typemaps for Javascript.
2023-05-12: olly
[Java] #2556 Suppress Java removal warnings on finalize method.
SWIG will need to stop relying on finalize methods, but we know
that and meanwhile these warnings make the testsuite output very
noisy.
2023-05-11: olly
#302 #2079 #2474 Parse storage class more flexibly.
Previously we had a hard-coded list of allowed combinations in the
grammar, but this suffers from combinatorial explosion, and results
in a vague `Syntax error in input` error for invalid (and missing)
combinations.
This means we now support a number of cases which are valid C++ but
weren't supported, including `friend constexpr` and `virtual
explicit`.
2023-05-08: olly
#1567 Add support for std::string_view (new in C++17) for C#, Java,
Lua, Perl, PHP, Python, Ruby and Tcl.
2023-05-08: olly
[PHP] #2544 Wrap overloaded method with both static and non-static
forms. We now wrap this as a non-static method in PHP, which means
the static form only callable via an object.
Previously this case could end up wrapped as static or non-static
in PHP. If it was wrapped as static, attempting to call non-static
overloaded forms would crash with a segmentation fault.
2023-05-06: mmomtchev, wsfulton
#2550 Fix typedef/using declarations to a typedef struct/class.
2023-05-04: erezgeva
[D] #2538 Drop support for D1/Tango, which was discontinued in
2012. Wrappers for D2/Phobos are now generated by default, though
the -d2 command line option is still accepted (and now ignored) for
backward compatibility.
*** POTENTIAL INCOMPATIBILITY ***
2023-04-27: olly
#2502 Allow using snprintf() instead of sprintf() in wrappers.
We aim to produce code that works with C90 or C++98 so we can't
assume snprintf() is available, but it almost always is (even
on systems from before it was standardised) so having a way to
use it is helpful.
We enable this automatically if the compiler claims conformance
with at least C99 or C++11. It can also be enabled manually by
defining SWIG_HAVE_SNPRINTF. Define SWIG_NO_SNPRINTF to disable
completely.
The fallback is to call sprintf() without a buffer size check,
which is what we've done until now. Adding a check after the
call seems of limited benefit - if the buffer was overflowed
then it's too late to block it, and most of our uses either have a
fixed maximum possible size or dynamically allocate a buffer that's
large enough.
2023-04-26: mmomtchev
[Javascript] Take into account numinputs when counting arguments.
2023-04-24: olly
[PHP] Add throws typemaps for std:string* and const std::string*.
2023-04-23: olly
[Javascript] #2453 The testsuite and examples now select which
Javascript engine to test based on what was detected by configure.
Previously they'd always test with node you specified a different
engine (e.g. with `ENGINE=jsc` on the make command line). Now you
only need to specify ENGINE if you have more than one engine
installed.
2023-04-23: olly
[Javascript] Turn on C++ output when wrapping for node, like
we already do when wrapping for V8-without-node.
The testsuite was masking this bug by using SWIG options
`-v8 -DBUILDING_NODE_EXTENSION=1` rather than `-node` when testing
with nodejs, while the javascript examples were masking this by
all getting processed with -c++.
This shouldn't be an incompatible change for users, as if you're
wrapping a C API you'd have to be working around the problem before
this change (like our testsuite and examples were), and this change
shouldn't break your workaround - it just makes it unnecessary.
2023-04-21: mmomtchev
[Javascript] Fix naming of internal C++ helper for wrapping
variables for node to use the "getter" naming scheme rather
than the function wrapping one. In practice this didn't actually
cause problems because Node wrappers are always compiled as C++
and the parameters are always different even if the names are
the same.
2023-04-21: olly
[PHP] Support INPUT,INOUT,OUTPUT for std::string&.
By default SWIG/PHP wraps std::string& as a pass-by-reference PHP
string parameter, but sometimes such a parameter is only for input
or only for output, so add support for the named typemaps that other
target languages support.
2023-04-21: degasus
#2519 Fix CanCastAsInteger range check to clear errno first to fix
bogus failures for valid inputs.if errno is set.
2023-04-21: ZackerySpytz
[OCaml] #1439 Fix reference typemaps for std::string
2023-04-21: olly
#2183 Fix #ifdef and #ifndef to work inside a %define. Previously
they were silently ignored in this context (but #if defined already
worked here if you need a workaround which works for older
versions).
2023-04-20: erezgeva
[Go] #2533 Implement argcargv.i library for Go.
2023-04-19: davidcl
[Scilab] Add support for Scilab 2023.x.
Introduce a `-gatewayxml6` options to generate an XML with full
function names.
2023-04-19: mmomtchev
https://sourceforge.net/p/swig/bugs/1163/ #1882 #2525
Fix preprocessor expansion when a macro expands to the name of
another macro which takes parameters from the input following the
original macro expansion.
2023-04-19: wildmaples
[Ruby] #2527 Fix "undefining the allocator of T_DATA" warning seen
with Ruby 3.2.
2023-04-18: davidcl
[Scilab] #894 extract values with ":" for typemap (int* IN, int IN_SIZE)
2023-04-14: olly
[PHP7] Support for PHP7 has been removed. PHP7 security support
ended 2022-11-28 so it doesn't make sense to include support for
it in the SWIG 4.2.x release series.
*** POTENTIAL INCOMPATIBILITY ***
2023-04-05: wsfulton
[Python] #2515 Add support for all STL containers to be constructible from a Python set.
The previous implementation used the Python Sequence Protocol to convert from Python types
to STL containers. The new implementation uses the Python Iterator Protocol instead and
thereby can convert from a Python set too.
2023-03-25: alatina
[Octave] #2512 Add support for Octave 8.1.
2023-03-22: wsfulton
[C#] #2478 Minor enhancements to std::array wrappers in std_array.i.
2023-03-13: wsfulton
Improved error checking when using %template to instantiate templates within
the correct scope.
1. When a template is instantiated via %template and uses the unary scope
operator ::, an error occurs if the instantiation is attempted within a
namespace that does not enclose the instantiated template.
For example, the following will now error as ::test::max is not enclosed within test1:
Error: '::test::max' resolves to 'test::max' and was incorrectly instantiated in
scope 'test1' instead of within scope 'test'.
namespace test1 {
%template(maxchar) ::test::max<char>;
}
2. SWIG previously failed to always detect a template did not exist when using
%template. In particular when instantiating a global template incorrectly within
namespace. The code below now correctly emits an error:
Error: Template 'test5::GlobalVector' undefined.
namespace test5 {
}
template<typename T> struct GlobalVector {};
%template(GVI) test5::GlobalVector<int>;
2023-03-13: wsfulton
Error out if an attempt is made to define a class using the unary scope
operator ::. The following is not legal C++ and now results in an error:
Error: Using the unary scope operator :: in class definition '::Space2::B' is invalid.
namespace Space2 {
struct B;
}
struct ::Space2::B {};
2023-03-08: wsfulton
Fix duplicate const in generated code when template instantiation type is const
and use of template parameter is also explicitly const, such as:
template <typename T> struct Conster {
void cccc1(T const& t) {}
};
%template(ConsterInt) Conster<const int>;
Above previously led to generated code:
(arg1)->cccc1((int const const &)*arg2);
instead of
(arg1)->cccc1((int const &)*arg2);
2023-03-01: wsfulton
Partial template specialization fixes to support default arguments from the primary
template's parameter list.
template<class Y, class T=int> struct X { void primary() {} };
// Previously the specialization below resulted in:
// Error: Inconsistent argument count in template partial specialization. 1 2
template<class YY> struct X<YY*> { void special(YY*) {} };
// Both of these correctly wrap the partially specialized template
%template(StringPtr) X<const char *>;
%template(ShortPtr) X<short *, int>;
2023-02-15: wsfulton
#1300 Further partial template specialization fixes.
Fixes when templates are used as a template parameter in a partially specialized
instantiation such as:
template<typename V> struct Vect {};
template<class T, typename TT> class Foo { ... };
template<class TS, typename TTS> class Foo<Vect<TS>, TTS> { ... };
%template(VectInt) Vect<int>;
%template(FooVectIntDouble) Foo<Vect<int>, double>; // was previously attempting to use primary template
Also fixes partial specialization where the same template parameter name is used twice,
for example:
template<typename X, typename Y> struct H { ... };
template<typename T> struct H<T, T> { ... };
%template(HInts) H<int, int>; // was previously attempting to use primary template
2023-01-27: jschueller
#2492 [python] Fix unused parameter warnings for self parameter in
generated C/C++ wrapper code.
2023-01-14: wsfulton
Fix deduction of partially specialized template parameters when the specialized
parameter is non-trivial, used in a wrapped method and the type to %template uses
typedefs. For example:
typedef double & DoubleRef;
template <typename T> struct XX {};
template <typename T> struct XX<T &> { void fn(T t) {} };
%template(XXD) XX<DoubleRef>;
The type of the parameter in the instantiated template for fn is now correctly deduced
as double.
2023-01-03: wsfulton
#983 Fix seg fault when instantiating templates with parameters that are function
parameters containing templates, such as:
%template(MyC) C<int(std::vector<int>)>;
2023-01-03: wsfulton
Complete support for C++11 variadic function templates. Support was previously limited
to just one template parameter. Now zero or more template parameters are supported
in the %template instantiation.
2022-12-29: wsfulton
#1863 Syntax error fixes parsing more elaborate parameter pack arguments that are
used in function pointers, member function pointers:
template <typename... V> struct VariadicParms {
void ParmsFuncPtrPtr(int (*)(V*...)) {}
void ParmsFuncPtrPtrRef(int (*)(V*&...)) {}
void ParmsFuncPtrPtrRValueRef(int (*)(V*&&...)) {}
void ParmsFuncPtrRef(int (*)(V&...)) {}
void ParmsFuncPtrRValueRef(int (*)(V&&...)) {}
void ParmsMemFuncPtrPtr(int (KlassMemFuncs::*)(V*...)) {}
void ParmsMemFuncPtrPtrRef(int (KlassMemFuncs::*)(V*&...)) {}
void ParmsMemFuncPtrPtrRValueRef(int (KlassMemFuncs::*)(V*&&...)) {}
void ParmsMemFuncPtrRef(int (KlassMemFuncs::*)(V&...)) {}
void ParmsMemFuncPtrRValueRef(int (KlassMemFuncs::*)(V&&...)) {}
};
%template(VariadicParms0) VariadicParms<>;
%template(VariadicParms1) VariadicParms<A>;
Also in various other places such as within noexcept specifiers:
template<typename T, typename... Args>
void emplace(Args &&... args) noexcept(
std::is_nothrow_constructible<T, Args &&...>::value);
2022-12-27: wsfulton
Fix instantiation of variadic class templates containing parameter pack arguments that
are function pointers.
template <typename... V> struct VariadicParms {
void ParmsFuncPtrVal(int (*)(V...)) {}
};
%template(VariadicParms0) VariadicParms<>;
%template(VariadicParms1) VariadicParms<A>;
2022-12-23: wsfulton
#1863 Fix syntax error parsing variadic templates containing parameter pack arguments that
are function pointers.
2022-12-22: wsfulton
Complete support for C++11 variadic class templates. Support was previously limited
to just one template parameter. Now zero or more template parameters are supported.
2022-12-06: wsfulton
#1636 Fix syntax error for misplaced Doxygen comment after struct/class member.
Fix syntax error using Doxygen member groups syntax, "///*}", when used after
final struct/class member.
2022-12-05: wsfulton
#2023 Fix garbled Doxygen post comments in parameter lists.
Fix syntax error parsing a trailing Doxygen comment in parameter lists.
2022-12-03: wsfulton
#1609 Fix syntax error parsing of Doxygen comments after last enum item.
2022-12-03: wsfulton
#1715 Fix syntax error parsing of unconventionally placed Doxygen post
comments for enum items.
2022-12-02: wsfulton
#624 #1021 Improved template template parameters support. Previously, specifying more
than one simple template template parameter resulted in a parse error. Now
multiple template template parameters are working including instantiation with
%template. Example:
template <template<template<class> class, class> class Op, template<class> class X, class Y>
class C { ... };
2022-11-26: wsfulton
#1589 #1590 Slightly better decltype() support for expressions, such as:
int i,j;
... decltype(i+j) ...
... decltype(&i) ...
These result in a warning for non-trivial expressions which SWIG cannot evaluate:
Warning 344: Unable to deduce decltype for 'i+j'.
See 'Type Inference' in CPlusPlus.html for workarounds.
2022-11-22: wsfulton
#366 #1037 Fix seg fault handling template parameter expressions
containing '<=' or '>='.
2022-11-18: wsfulton
Duplicate class template instantiations via %template now issue a warning and are ignored.
%template(Aint) A<int>;
%template(Aint2) A<int>; // Now ignored and issues a warning
example.i:7: Warning 404: Duplicate template instantiation of 'A< int >' with name 'Aint2' ignored,
example.i:6: Warning 404: previous instantiation of 'A< int >' with name 'Aint'.
A single empty template instantiation before a named instantiation is the one exception
for allowing duplicate template instantiations as the empty template instantiation does not
create a wrapper for the template, it merely adds the instantiation into SWIG's internal
type system.
Duplicate empty template instantiations are quietly ignored.
%template() B<int>;
%template(Bint) B<int>; // OK
%template() C<int>;
%template() C<int>; // Quietly ignored now
%template(Cint) C<int>; // OK
Note that default template parameters are considered when looking for duplicates such as:
template <typename T, typename U = short> struct D {};
%template(Dint) D<int>;
%template(Dintshort) D<int, short>;
example.i:7: Warning 404: Duplicate template instantiation of 'D< int,short >' with name 'Dintshort' ignored,
example.i:6: Warning 404: previous instantiation of 'D< int >' with name 'Dint'.
Note that the following always was ignored, but that was because the chosen name was a
duplicate rather than the template being a duplicate:
%template(Eint) E<int>;
%template(Eint) E<int>; // Always has been ignored as a redefined identifier
The old warning was:
example.i:7: Warning 302: Identifier 'Eint' redefined (ignored) (Renamed from 'E< int >'),
example.i:6: Warning 302: previous definition of 'Eint' (Renamed from 'E< int >').
*** POTENTIAL INCOMPATIBILITY ***
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