Workaround printf moving to the stdlib (#93)

* Workaround printf moving to the stdlib

* More fixes for 0.7

Author: ararslan

src/BenchmarkTools.jl

@@ -6,6 +6,10 @@ using Compat
 using JSON
 using Base.Iterators
 
+if VERSION >= v"0.7.0-DEV.3052"
+    using Printf
+end
+
 const BENCHMARKTOOLS_VERSION = v"0.2.2"
 
 ##############

src/groups.jl

@@ -19,9 +19,13 @@ end
 # Dict-like methods #
 #-------------------#
 
+if VERSION < v"0.7.0-DEV.2731"
+    const empty = similar
+end
+
 @compat Base.:(==)(a::BenchmarkGroup, b::BenchmarkGroup) = a.tags == b.tags && a.data == b.data
 Base.copy(group::BenchmarkGroup) = BenchmarkGroup(copy(group.tags), copy(group.data))
-Base.similar(group::BenchmarkGroup) = BenchmarkGroup(copy(group.tags), similar(group.data))
+Base.similar(group::BenchmarkGroup) = BenchmarkGroup(copy(group.tags), empty(group.data))
 Base.isempty(group::BenchmarkGroup) = isempty(group.data)
 Base.length(group::BenchmarkGroup) = length(group.data)
 Base.getindex(group::BenchmarkGroup, i...) = getindex(group.data, i...)

test/ExecutionTests.jl

@@ -3,7 +3,9 @@ module ExecutionTests
 using BenchmarkTools
 using Compat
 using Compat.Test
-@static if VERSION >= v"0.7.0-DEV.2655" # IterativeEigenSolvers to stdlib
+if VERSION >= v"0.7.0-DEV.3019"
+    using IterativeEigensolvers
+elseif VERSION >= v"0.7.0-DEV.2655"
     using IterativeEigenSolvers
 end
 
@@ -170,7 +172,7 @@ let fname = tempname()
                 @test a === nothing
             end
         end
-        s = readstring(fname)
+        s = read(fname, String)
         try
             @test ismatch(r"[0-9.]+ \w*s \([0-9]* allocations?: [0-9]+ bytes\)", s)
         catch