[Mono-dev] mcs patch for preprocessor directive

[Atsushi Eno]

Hi,

Here is a patch that contains some preprocessor fixes:

	- It didn't report expected location (tiny fix).
	- When -langversion:ISO-1 is specified, #pragma directive
	  is always checked, even when it is actually disabled
	  by #if directive. (Because of this bug, currently
	  mscorlib cannot be compiled with csc.)
	- Syntax for #define and #undef are checked even when
	  they are inside disabled block.
	- On the other hand, syntax for #line directive is
	  not checked unless it is enabled.

Attached a small example repro code.

Atsushi Eno

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