In rPHUcc66c966346cdf68727f3f638f268f5a6f621a40#ffe7dcca `scanner.l` was changed. However, these changes introduced illegal constructs in the file.
```
richard @richard-pc[/opt/arc/libphutil/support/xhpast]
-> make scanner parser all
flex -C --header-file=scanner.lex.hpp -o scanner.lex.cpp -d scanner.l
scanner.l:316: unrecognized rule
scanner.l:316: unrecognized rule
scanner.l:316: unrecognized rule
scanner.l:317: unrecognized rule
scanner.l:317: unrecognized rule
scanner.l:317: unrecognized rule
scanner.l:334: missing quote
scanner.l:335: missing quote
scanner.l:339: unrecognized rule
scanner.l:339: unrecognized rule
scanner.l:339: unrecognized rule
scanner.l:340: unrecognized rule
scanner.l:340: unrecognized rule
Makefile:33: recipe for target 'scanner' failed
make: *** [scanner] Error 1
```