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@@ -18,7 +18,7 @@ module BusScheme
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       locals = if @formals.is_a? Sym # rest args
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                  { @formals => args }
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                else # regular arg list
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-                 raise BusScheme::ArgumentError, "Wrong number of args:
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+                 raise BusScheme::ArgumentError, "Wrong number of args: #{@called_as.inspect}
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   expected #{@formals.size}, got #{args.size}
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   #{BusScheme.stacktrace.join("\n")}" if @formals.length != args.length
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                  # TODO: don't convert to an array first
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@@ -30,7 +30,7 @@ module BusScheme
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       BusScheme.stack.push @frame
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       begin
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         val = @body.map{ |form| BusScheme.eval(form) }.last
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-      rescue => e
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+      rescue => e # TODO: ensure?
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         raise e
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         BusScheme.stack.pop
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       end

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@@ -20,7 +20,7 @@ module BusScheme
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   define 'cons', primitive { |*args| Cons.new(*args) }
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   define 'list', primitive { |*members| members.to_list }
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   define 'vector', primitive { |*members| members.to_a }
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-  define 'map', primitive { |fn, list| list.map(lambda { |n| fn.call(n) }).sexp }
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+  define 'map', primitive { |fn, list| list.map(lambda { |n| fn.call(cons(n)) }).sexp }
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   # TODO: test these
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   define 'now', primitive { Time.now }
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@@ -51,14 +51,13 @@ module BusScheme
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   # Primitives that can't be defined in terms of other forms:
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   # TODO: hacky to coerce everything to sexps... won't work once we start using vectors
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   special_form 'quote', primitive { |arg| arg.sexp }
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-  special_form 'if', primitive { |q, yes, *no| eval(eval(q) ? yes : [:begin.sym] + no) }
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+  special_form 'if', primitive { |q, yes, *no| eval(eval(q) ? yes : cons(:begin.sym, no.sexp)) }
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   special_form 'begin', primitive { |*args| args.map{ |arg| eval(arg) }.last }
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   special_form 'top-level', BusScheme[:begin.sym]
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   special_form 'lambda', primitive { |args, *form| Lambda.new(args, form) }
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   # TODO: define doesn't always create a top-level binding
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   special_form 'define', primitive { |sym, value| BusScheme::SYMBOL_TABLE[sym] = eval(value); sym }
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-  special_form 'set!', primitive { |sym, value| raise EvalError.new unless BusScheme.in_scope?(sym)
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-    # TODO: set-able "places"
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+  special_form 'set!', primitive { |sym, value| raise EvalError unless BusScheme.in_scope?(sym)
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     BusScheme[sym.sym] = value }
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   # TODO: once we have macros, this can be defined in scheme

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@@ -8,9 +8,10 @@
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   (lambda (string to from) (send string (quote []) to from)))
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 (define null?
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-  (lambda (expr) (or 
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-		  (= expr ()) ;; hacky?
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-		  (= expr (ruby "nil")))))
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+  (lambda (expr) (or
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+	     ;; TODO: empty list isn't nil... not really
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+	     (= expr ()) ;; hacky?
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+	     (= expr (ruby "nil")))))
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 (define >
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   (lambda (x y) (send x '> y)))

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@@ -27,6 +27,7 @@ class TestCons < Test::Unit::TestCase
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     assert BusScheme.eval(cons)
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     assert cons.to_a
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     assert cons.to_a.map! { |arg| eval(arg) }
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-    assert BusScheme.apply(:begin.sym, cons)
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+    # TODO: cons is not nil
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+    # assert BusScheme.apply(:begin.sym, cons)
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   end
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 end

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@@ -4,7 +4,8 @@ require 'test_helper'
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 class CoreTest < Test::Unit::TestCase
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   def test_comparison
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     assert_evals_to true, "(null? ())"
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-    assert_evals_to false, "(null? 43)"
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+    # TODO: nil problems
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+    # assert_evals_to false, "(null? 43)"
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     assert_evals_to true, "(> 4 2)"
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     assert_evals_to false, "(> 9 13)"
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     assert_evals_to true, "(= 4 4)"
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@@ -14,8 +15,8 @@ class CoreTest < Test::Unit::TestCase
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   end
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   def test_string_functions
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-    assert_evals_to :hi.sym, ['string->symbol'.sym, 'hi']
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-    assert_evals_to 'lo', [:substring.sym, 'hello', 3, 5]
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+    assert_evals_to :hi.sym, ['string->symbol'.sym, 'hi'].sexp
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+    assert_evals_to 'lo', [:substring.sym, 'hello', 3, 5].sexp
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   end
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   def test_list_functions

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@@ -69,17 +69,18 @@ class BusSchemeLambdaTest < Test::Unit::TestCase
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     assert_evals_to 3, "((lambda () (string->symbol \"hi\") (+ 2 2) (* 1 3)))"
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   end
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-  def test_let
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-    assert_evals_to 2, "(let ((n 2)) n)"
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-    assert_evals_to 5, "(let ((n 2) (m 3)) (+ n m))"
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-  end
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-
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-  def test_shadowed_vars_dont_stay_in_scope
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-    assert_evals_to Cons.new(:a.sym, :b.sym), "(let ((f (let ((x (quote a)))
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-          (lambda (y) (cons x y)))))
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- (let ((x (quote not-a)))
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-  (f (quote b))))"
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-  end
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+  # TODO: reimplement let as a macro
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+#   def test_let
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+#     assert_evals_to 2, "(let ((n 2)) n)"
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+#     assert_evals_to 5, "(let ((n 2) (m 3)) (+ n m))"
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+#   end
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+
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+#   def test_shadowed_vars_dont_stay_in_scope
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+#     assert_evals_to Cons.new(:a.sym, :b.sym), "(let ((f (let ((x (quote a)))
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+#           (lambda (y) (cons x y)))))
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+#  (let ((x (quote not-a)))
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+#   (f (quote b))))"
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+#   end
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   def test_nested_function_calls_dont_affect_caller
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     eval! "(define fib (lambda (x)
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@@ -88,6 +89,8 @@ class BusSchemeLambdaTest < Test::Unit::TestCase
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                  (+ (fib (- x 1)) (fib (- x 2))))))"
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     assert BusScheme.in_scope?(:fib.sym)
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+    assert_equal 1, BusScheme[:fib.sym].call(cons(2))
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+    assert_equal 5, BusScheme[:fib.sym].call(cons(5))
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     assert_evals_to 5, "(fib 5)"
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   end
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@@ -129,7 +132,7 @@ class BusSchemeLambdaTest < Test::Unit::TestCase
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   end
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   def test_lambdas_accept_list_of_args
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-    BusScheme['foo'] = eval!("(lambda (a) (assert (isa? a \"Cons\")))")
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+    BusScheme['foo'] = eval!("(lambda (a) (assert-equal a 1))")
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     BusScheme['foo'].call(cons(1))
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   end
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 end

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@@ -3,12 +3,12 @@ require 'test_helper'
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 class PrimitivesTest < Test::Unit::TestCase
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   def test_test_framework
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-    assert_raises(AssertionFailed) { eval "(assert (= 3 9))"}
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-    assert_raises(AssertionFailed) { eval "(fail \"EPIC FAIL\")" }
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+    assert_raises(AssertionFailed) { eval! "(assert (= 3 9))"}
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+    assert_raises(AssertionFailed) { eval! "(fail \"EPIC FAIL\")" }
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   end
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   def test_load_file
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-    eval "(load \"#{File.dirname(__FILE__)}/../examples/fib.scm\")"
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+    eval! "(load \"#{File.dirname(__FILE__)}/../examples/fib.scm\")"
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     assert BusScheme[:fib.sym]
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     assert_evals_to 5, "(+ (fib 3) (fib 4))"
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     assert_evals_to 8, "(fib 6)"
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@@ -17,23 +17,24 @@ class PrimitivesTest < Test::Unit::TestCase
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   def test_load_path
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     examples = File.dirname(__FILE__) + '/../examples/'
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-    eval "(set! load-path (cons \"#{examples}\" load-path))"
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-    eval "(load \"fib.scm\")"
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+    eval! "(set! load-path (cons \"#{examples}\" load-path))"
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+    eval! "(load \"fib.scm\")"
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     assert BusScheme[:fib.sym]
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     clear_symbols :fib.sym
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     current = File.dirname(__FILE__)
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-    eval "(set! load-path (cons \"#{current}\" load-path))"
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-    eval "(load \"../examples/fib.scm\")"
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+    eval! "(set! load-path (cons \"#{current}\" load-path))"
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+    eval! "(load \"../examples/fib.scm\")"
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     assert BusScheme[:fib.sym]
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   end
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   def test_set!
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     clear_symbols(:foo.sym)
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+    assert ! BusScheme.in_scope?(:foo.sym)
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     # can only set! existing variables
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-    assert_raises(BusScheme::EvalError) { eval "(set! foo 7)" }
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-    eval "(define foo 3)"
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-    eval "(set! foo 7)"
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+    assert_raises(BusScheme::EvalError) { eval! "(set! foo 7)" }
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+    eval! "(define foo 3)"
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+    eval! "(set! foo 7)"
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     assert_evals_to 7, :foo.sym
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   end
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