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* improve diagnostic messages and prevent fatal errors from crashing the compiler.
* fix top level exception catching.
* spelling fix
* change wording of invalidSwizzleExpr diagnostic
* add speculative GenericsApp expr parsing
* add new test case of cascading generics call.
* Fixing bugs in compiling cascaded generic function calls.
Add implementation of DeclaredSubTypeWitness::SubstituteImpl()
This is not needed by the type checker, but needed by IR specialization. When input source contains cascading generic function call, the arguments to `specialize` instruction is currently represented as a substitution. The arg values of this subsittution can be a `DeclaredSubTypeWitness` when a generic function uses one of its generic parameter to specialize another generic function. When the top level generics function is being specialized, this substitution argument, which is a `DeclaredSubTypeWitness`, needs to be substituted with the witness that used to specialize the top level function in the specialized specialize instruction as well.
* add a test case for cascading generic function call.
* parser bug fix
* fixes #255
* add test case for issue #255
* Generate missing `specialize` instruction when calling a generic method from an interface constraint.
When calling a generic method via an interface, we should be generating the following ir:
...
f = lookup_interface_method(...)
f_s = specailize(f, declRef)
...
This commit fixes this `emitFuncRef` function to emit the needed `specialize` instruction.
* fixes #260
This fix follows the second apporach in the disucssion. It generated mangled name for specialized functions by appending new substitution type names to the original mangled name.
* Disabling removing and re-inserting specailized functions in getSpecalizeFunc()
I am not sure why it is needed, it seems HLSL and GLSL backends are generating forward declarations anyways, so the order of functions in IRModule shouldn't matter.
* cleanup and complete test cases.
* fix warnings
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