Exported variables: no longer add export scope to every function, allow freely access and modifiy variable in function scope

Too many issues with predefining exported variables, and this is more flexible.

test/results/exported variable nested.ans

@@ -1,11 +1,14 @@
 --# run #--
 --- text ---
+| {}"kk" |
+| {}"ko" |
+--- text ---
 | {}"" {}"42" {}"" |
 --- error ---
-./anselme/stdlib/closure.lua:15: no exported variable "y" defined in closure
-	↳ from test/tests/exported variable nested.ans:10:4 in call: f . "y"
-	↳ from test/tests/exported variable nested.ans:10:1 in text interpolation: | {f . "y"} |
-	↳ from test/tests/exported variable nested.ans:10:1 in translatable: | {f . "y"} |
+identifier "z" is undefined in branch 6843ee85-cea8-445d-10f21-9a8e54372094
+	↳ from test/tests/exported variable nested.ans:12:3 in identifier: z
+	↳ from test/tests/exported variable nested.ans:12:1 in text interpolation: | {z} |
+	↳ from test/tests/exported variable nested.ans:12:1 in translatable: | {z} |
 	↳ from ? in block: :f = ($() _)…
 --# saved #--
 {}

test/results/function exported.ans

@@ -8,7 +8,7 @@
 --- text ---
 | {}"" {}"1" {}"" |
 --- text ---
-| {}"exported:" |
+| {}"upvalue:" |
 --- text ---
 | {}"" {}"1" {}"" |
 --- text ---

test/tests/exported variable nested.ans

@@ -5,6 +5,8 @@
 		:@z = 12
 	| ko
 
-|{f.x}
+f!
 
-|{f.y}
+|{x}
+
+|{z}

test/tests/exported variable.ans

@@ -1,4 +1,5 @@
 :f = $
 	:@x = "ok"
+f!
 
-f.x
+x

test/tests/function exported.ans

@@ -6,11 +6,10 @@
 	a = a + 1
 
 :$ g
-	:@a = 1
-
 	|{a}
 
 	a = a + 1
+g.:a = 1
 
 |local:
 
@@ -20,7 +19,7 @@ f!
 
 f!
 
-|exported:
+|upvalue:
 
 g!
 

test/tests/function scope.ans

@@ -1,4 +1,5 @@
+:b = 5
 :$ a
-	:@b = 5
+	:b = 12
 
 |a: {a.b}

test/tests/namespace operator arbitrary expression.ans

@@ -1,5 +1,7 @@
 :$ f
-	:@x = 5
+	()
+
+f.:x = 5
 
 :a = f