prevent type piracy on Base.merge (#37)

Author: KristofferC

src/crayon.jl

@@ -275,13 +275,9 @@ end
 
 Base.:*(a::Crayon, b::Crayon) = merge(a, b)
 
-function Base.merge(toks::Crayon...)
-    if length(toks) == 0
-        return Crayon()
-    end
-    tok = toks[1]
-    for i in 2:length(toks)
-        tok = merge(tok, toks[i])
+function Base.merge(tok::Crayon, toks::Crayon...)
+    for tok2 in toks
+        tok = merge(tok, tok2)
     end
     return tok
 end

test/runtests.jl

@@ -110,7 +110,6 @@ pop!(cs) # State change: fg = default
 @test string(cs) == string(Crayon(foreground = :default))
 
 # Merge
-@test string(merge()) == ""
 @test string(merge(Crayon(foreground = :blue, background = :red))) == string(Crayon(foreground = :blue, background = :red))
 @test string(merge(Crayon(foreground = :blue), Crayon(background = :red)))  == string(Crayon(foreground = :blue, background = :red))
 @test string(merge(Crayon(foreground = :blue), Crayon(background = :red), Crayon(bold = true)))  == string(Crayon(foreground = :blue, background = :red, bold = true))