std.string.lineSplitter is missing in the GDC compiler

[Haiwei via D.gnu]

Hi,

   I try to compile dlangide with gdc 5.2.1. It complains that

~/shared/dlang/dlangide$ dub build
Performing "debug" build using gdc for x86_64.
experimental_allocator 2.70.0-b1: target for configuration 
"library" is up to date.
emsi_containers 0.3.0: target for configuration "library" is up 
to date.
libdparse 0.3.0: building configuration "library"...
../../../.dub/packages/libdparse-0.3.0/src/dparse/lexer.d:1878:12: error: module std.string import 'lineSplitter' not found
      import std.string : lineSplitter, stripRight;

  I found there is no lineSplitter in the std/string.d in the gdc 
library.
  Is that a bug?

Thanks,
Haiwei