[Issue 22814] New: ImportC: C11 lexer deletes escaped new lines during translation

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22814

          Issue ID: 22814
           Summary: ImportC: C11 lexer deletes escaped new lines during
                    translation
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: ibuclaw at gdcproject.org

Following on from issue 22812, while new lines can't be ignored, they can
however be escaped.

>From C11 5.1.1.2-2:
---
Each instance of a backslash character ( \) immediately followed by a new-line
character is deleted, splicing physical source lines to form logical source
lines. Only the last backslash on any physical source line shall be eligible
for being part of such a splice. A source file that is not empty shall end in a
new-line character, which shall not be immediately preceded by a backslash
character before any such splicing takes place.
---


So whilst issue 22812 is an error, this should be accepted as valid:
---
# \
    pragma \
pack \
    ( \
2 \
    )
struct S
{
    int i;
    short j;
    double k;
};
# \
    pragma \
pack \
    ( \
)
---

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