// Unusual case where a preprocessor comment (same symbol as a single-line
// comment, "//") is embedded in an emitted C-style comment.
// This should not preprocess, but not parse, i.e. in the emitted text, there
// will be an opening // C-style comment symbol "/*" but no closing symbol "*/".
`define A \
A1 \
A2 /* emitted */ \
A3 /* // not emitted, unclosed C comment */ \
A4
// Same as A, but without space before "//".
// This may catch bad parsers where the first "/" in "//" is treated as part of
// the closing "*/".
`define B \
B1 \
B2 /* emitted */ \
B3 /*// not emitted, unclosed C comment */ \
B4
// Another variation on B.
`define C \
C1 \
C2 /* emitted */ \
C3 //* not emitted, C comment is closed */ \
C4
// Another variation on B.
`define D \
D1 \
D2 /* emitted */ \
D3 /* emitted, unclosed C comment *// \
D4
`A
`B
`C
`D