Reorganize tests and benchmark scripts.

Mainly to get rid of one top level directory. But this will
also be useful when there are tests of the embedding API.

test/language/function/empty_body.wren

@@ -0,0 +1,2 @@
+var f = new Fn {}
+IO.print(f.call()) // expect: null

test/language/function/newline_body.wren

@@ -0,0 +1,4 @@
+var f = new Fn {
+  // Hi.
+}
+IO.print(f.call()) // expect: null

test/language/function/newline_in_expression_block.wren

@@ -0,0 +1,5 @@
+new Fn { IO.print("ok") // expect error
+}.call() // expect error
+
+// The second error is cascaded here. If it starts failing, just remove that
+// expectation.

test/language/function/no_newline_before_close.wren

@@ -0,0 +1,2 @@
+new Fn {
+  IO.print("ok") } // expect error

test/language/function/no_parameters.wren

@@ -0,0 +1 @@
+new Fn {|| null } // expect error

test/language/function/parameters.wren

@@ -0,0 +1,50 @@
+var f0 = new Fn { 0 }
+IO.print(f0.call()) // expect: 0
+
+var f1 = new Fn {|a| a }
+IO.print(f1.call(1)) // expect: 1
+
+var f2 = new Fn {|a, b| a + b }
+IO.print(f2.call(1, 2)) // expect: 3
+
+var f3 = new Fn {|a, b, c| a + b + c }
+IO.print(f3.call(1, 2, 3)) // expect: 6
+
+var f4 = new Fn {|a, b, c, d| a + b + c + d }
+IO.print(f4.call(1, 2, 3, 4)) // expect: 10
+
+var f5 = new Fn {|a, b, c, d, e| a + b + c + d + e }
+IO.print(f5.call(1, 2, 3, 4, 5)) // expect: 15
+
+var f6 = new Fn {|a, b, c, d, e, f| a + b + c + d + e + f }
+IO.print(f6.call(1, 2, 3, 4, 5, 6)) // expect: 21
+
+var f7 = new Fn {|a, b, c, d, e, f, g| a + b + c + d + e + f + g }
+IO.print(f7.call(1, 2, 3, 4, 5, 6, 7)) // expect: 28
+
+var f8 = new Fn {|a, b, c, d, e, f, g, h| a + b + c + d + e + f + g + h }
+IO.print(f8.call(1, 2, 3, 4, 5, 6, 7, 8)) // expect: 36
+
+var f9 = new Fn {|a, b, c, d, e, f, g, h, i| a + b + c + d + e + f + g + h + i }
+IO.print(f9.call(1, 2, 3, 4, 5, 6, 7, 8, 9)) // expect: 45
+
+var f10 = new Fn {|a, b, c, d, e, f, g, h, i, j| a + b + c + d + e + f + g + h + i + j }
+IO.print(f10.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)) // expect: 55
+
+var f11 = new Fn {|a, b, c, d, e, f, g, h, i, j, k| a + b + c + d + e + f + g + h + i + j + k }
+IO.print(f11.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11)) // expect: 66
+
+var f12 = new Fn {|a, b, c, d, e, f, g, h, i, j, k, l| a + b + c + d + e + f + g + h + i + j + k + l }
+IO.print(f12.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)) // expect: 78
+
+var f13 = new Fn {|a, b, c, d, e, f, g, h, i, j, k, l, m| a + b + c + d + e + f + g + h + i + j + k + l + m }
+IO.print(f13.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)) // expect: 91
+
+var f14 = new Fn {|a, b, c, d, e, f, g, h, i, j, k, l, m, n| a + b + c + d + e + f + g + h + i + j + k + l + m + n }
+IO.print(f14.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)) // expect: 105
+
+var f15 = new Fn {|a, b, c, d, e, f, g, h, i, j, k, l, m, n, o| a + b + c + d + e + f + g + h + i + j + k + l + m + n + o }
+IO.print(f15.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)) // expect: 120
+
+var f16 = new Fn {|a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p| a + b + c + d + e + f + g + h + i + j + k + l + m + n + o + p }
+IO.print(f16.call(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)) // expect: 136

test/language/function/syntax.wren

@@ -0,0 +1,25 @@
+// Single expression body.
+new Fn { IO.print("ok") }.call() // expect: ok
+
+// Curly body.
+new Fn {
+  IO.print("ok") // expect: ok
+}.call()
+
+// Multiple statements.
+new Fn {
+  IO.print("1") // expect: 1
+  IO.print("2") // expect: 2
+}.call()
+
+// Extra newlines.
+new Fn {
+
+
+  IO.print("1") // expect: 1
+
+
+  IO.print("2") // expect: 2
+
+
+}.call()