make: unexpected "Unclosed substitution for foo (} missing)"

[Aleksey Cheusov <cheusov%tut.by@localhost>]

Hi. Is the following normal behaviour of bmake?
Curly and round braces work differently with variable modifiers.

   0 ~>cat ~/tmp/3.mk
   test:
        @echo ${foo::=foo-text}
   0 ~>cat ~/tmp/4.mk
   test:
        @echo $(foo::=foo-text)
   0 ~>nbmake -f ~/tmp/3.mk test

   0 ~>nbmake -f ~/tmp/4.mk test
   nbmake: Unclosed substitution for foo (} missing)

   0 ~>

-- 
Best regards, Aleksey Cheusov.