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Added 2 VM instructions, FnewE variant of Fnew with a dereference,
and FieldE, variant of Field with dereference.
It's now possible to pointers in structs and literal composites.
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The expressions were parsed from right to left, and it was incorrect and
cumbersome. Now they are processed from left to right, with a simpler
and correct handling of precedence rules.
The vm function call syntax has been changed to set the function
before the input arguments on the stack, as to follow the declaring
order in languages.
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Use 'unsafe' to modify private struct fields, allowing to keep
unmodified field names: before they were prefixed with a capital.
Parse package statement. Provide a also a default package name for
REPL and tests. The support of packages is still incomplete.
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A new `Composite` token is created. Literal composite expressions
are recognized and partially handled by the parser but not yet
by the code generator.
Other cosmetic changes are present.
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Also detection and automatic execution of main function.
Make sure that all debug is output to stderr.
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Type and Value types in vm package are now used in place of reflect.Type
and reflect.Value. It allows to remove the dependency on reflect for
parser and compiler packages.
The main purpose of Type is to provide a solution to implement recursive
structs, named types, interfaces and methods, despite the limitations of
Go reflect. The goal is to provide the thinnest layer around reflect.
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