diff --git a/anselme/common/init.lua b/anselme/common/init.lua
index f40fcdf..4b7508f 100644
--- a/anselme/common/init.lua
+++ b/anselme/common/init.lua
@@ -39,11 +39,9 @@ local common = {
 			{ "%", 11 },
 		},
 		suffixes = {
-			{ ";", 1 },
 			{ "!", 12 }
 		},
 		infixes = {
-			{ ";", 1 },
 			{ "#", 2 }, { "->", 2 },
 			{ "=", 3 },
 			{ "&", 5 }, { "|", 5 },
@@ -58,6 +56,8 @@ local common = {
 	},
 	-- list of all operators and their priority
 	operator_priority = {
+		["_;"] = 1,
+		["_;_"] = 1,
 		[";_"] = 1,
 		["$_"] = 2,
 		["_,_"] = 2,
diff --git a/anselme/parser/expression/secondary/infix/semicolon.lua b/anselme/parser/expression/secondary/infix/semicolon.lua
index 17c0d5e..604ed55 100644
--- a/anselme/parser/expression/secondary/infix/semicolon.lua
+++ b/anselme/parser/expression/secondary/infix/semicolon.lua
@@ -1,9 +1,19 @@
 local infix_or_suffix = require("anselme.parser.expression.secondary.infix.infix_or_suffix")
-
 local operator_priority = require("anselme.common").operator_priority
 
+local ast = require("anselme.ast")
+local Block = ast.Block
+
 return infix_or_suffix {
 	operator = ";",
 	identifier = "_;_",
-	priority = operator_priority["_;_"]
+	priority = operator_priority["_;_"],
+
+	build_ast = function(self, left, right)
+		if Block:is(left) then
+			left:add(right)
+		else
+			return Block:new(left, right)
+		end
+	end
 }
diff --git a/anselme/parser/expression/secondary/suffix/semicolon.lua b/anselme/parser/expression/secondary/suffix/semicolon.lua
index 823b1eb..5a92b2f 100644
--- a/anselme/parser/expression/secondary/suffix/semicolon.lua
+++ b/anselme/parser/expression/secondary/suffix/semicolon.lua
@@ -1,9 +1,19 @@
 local suffix = require("anselme.parser.expression.secondary.suffix.suffix")
-
 local operator_priority = require("anselme.common").operator_priority
 
+local ast = require("anselme.ast")
+local Block, Nil = ast.Block, ast.Nil
+
 return suffix {
 	operator = ";",
 	identifier = "_;",
-	priority = operator_priority["_;"]
+	priority = operator_priority["_;"],
+
+	build_ast = function(self, left)
+		if Block:is(left) then
+			left:add(Nil:new())
+		else
+			return Block:new(left, Nil:new())
+		end
+	end
 }
diff --git a/anselme/stdlib/base.lua b/anselme/stdlib/base.lua
index d6e2844..41ea762 100644
--- a/anselme/stdlib/base.lua
+++ b/anselme/stdlib/base.lua
@@ -2,9 +2,6 @@ local ast = require("anselme.ast")
 local Nil, String = ast.Nil, ast.String
 
 return {
-	{ "_;_", "(left, right)", function(state, left, right) return right end },
-	{ "_;", "(left)", function(state, left) return Nil:new() end },
-
 	{
 		"print", "(a)",
 		function(state, a)
diff --git a/ideas.md b/ideas.md
index f9ceec2..e092e2d 100644
--- a/ideas.md
+++ b/ideas.md
@@ -79,10 +79,6 @@ Then again, performance has never been a goal of Anselme.
 
 ---
 
-Redesign the Node hierarchy to avoid cycles.
-
----
-
 Macros.
 
 Could be implemented by creating functions to build AST nodes from Anselme that can also take quotes as arguments.