This is the version of Piglit that is being used:
http://cgit.freedesktop.org/piglit/commit/?id=1f39e07d44f7d78557d69c505168afb8eab913c6

Here is the failing test output:
06/13 08:50:32.209 DEBUG|        base_utils:0239| [stdout] + Running test
[shaders/glsl-floating-constant-120] of expected runtime 0.0 sec:
[bin/shader_runner tests/shaders/glsl-floating-constant-120.shader_test -auto]
06/13 08:50:32.310 DEBUG|        base_utils:0239| [stderr] Failed to compile
FS: 0:5(14): error: syntax error, unexpected NEW_IDENTIFIER, expecting ',' or
';'
06/13 08:50:32.312 DEBUG|        base_utils:0239| [stderr] 
06/13 08:50:32.314 DEBUG|        base_utils:0239| [stdout] PIGLIT: {"result":
"fail" }
06/13 08:50:32.315 DEBUG|        base_utils:0239| [stdout] + fail ::
shaders/glsl-floating-constant-120