Don't join qualified names across newlines in parser#9772
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The parser's qualified name scanning would greedily combine a name followed by a backslash into a single qualified name even across line boundaries. This caused `my_func` on one line followed by `\root_ns_func()` on the next to be parsed as a single identifier `my_func\root_ns_func`, which broke autocomplete when the cursor was on a name preceding a root-namespace-qualified call. The fix checks for trailing EndOfLine trivia on the name token before allowing a backslash to continue a qualified name. If the name has a trailing newline, the backslash is treated as the start of a new expression. Human note: while this means the below is no longer valid Hack: ```hack $foo = Bar\ Baz\something(); ``` this doesn't seem to have been intended behavior and autocomplete being broken in positions preceding a `\`-qualified function call is arguably confusing. Such code is also not valid PHP (see https://onlinephp.io?s=RY09CsMwDIXnGHQHETq0V7BbOmTPCbw4rkIMrmX8k6X07rVTSsUD6Qm9T9d73CKIYJ6Uo7GEswJhvckZJ3yBGGJdvLOYiymtrTXY4jjgyny-SFyY_XE2kN0YR2qlw6j6JlGpKWBJlbp_g2gC8Ud0wM7u8QWcGhJvqGfd3STl8UL9Um38AA%2C%2C&v=8.2.20). Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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The parser's qualified name scanning would greedily combine a name followed by a backslash into a single qualified name even across line boundaries. This caused
my_funcon one line followed by\root_ns_func()on the next to be parsed as a single identifiermy_func\root_ns_func, which broke autocomplete when the cursor was on a name preceding a root-namespace-qualified call.The fix checks for trailing EndOfLine trivia on the name token before allowing a backslash to continue a qualified name. If the name has a trailing newline, the backslash is treated as the start of a new expression.
Human note: while this means the below is no longer valid Hack:
this doesn't seem to have been intended behavior and autocomplete being broken in positions preceding a
\-qualified function call is arguably confusing.Such code is also not valid PHP (see https://onlinephp.io?s=RY09CsMwDIXnGHQHETq0V7BbOmTPCbw4rkIMrmX8k6X07rVTSsUD6Qm9T9d73CKIYJ6Uo7GEswJhvckZJ3yBGGJdvLOYiymtrTXY4jjgyny-SFyY_XE2kN0YR2qlw6j6JlGpKWBJlbp_g2gC8Ud0wM7u8QWcGhJvqGfd3STl8UL9Um38AA%2C%2C&v=8.2.20).