diff --git a/parser/func_test.go b/parser/func_test.go
index c111e6d..7ad00d2 100644
--- a/parser/func_test.go
+++ b/parser/func_test.go
@@ -101,9 +101,9 @@ func ro gControlFlow
 			[otherThing]
 func ro hDataInit
 	---
-	[let x:Int 3]
-	[let y:{Int} [loc x]]
-	[let z:Int:8 (398 9 2309 983 -2387 478 555 123)]
-	[let bird:Bird ((99999) 324)]
+	[= x:Int 3]
+	[= y:{Int} [loc x]]
+	[= z:Int:8 (398 9 2309 983 -2387 478 555 123)]
+	[= bird:Bird ((99999) 324)]
 `, test)
 }
diff --git a/parser/phrase.go b/parser/phrase.go
index bcf71f3..da04024 100644
--- a/parser/phrase.go
+++ b/parser/phrase.go
@@ -312,8 +312,6 @@ func (parser *ParsingOperation) parsePhraseCommand () (
 		identifier := command.value.(Identifier)
 		if len(identifier.trail) == 1 {
 			switch identifier.trail[0] {
-			case "let":
-				kind = PhraseKindLet
 			case "loc":
 				kind = PhraseKindReference
 			case "defer":
diff --git a/parser/tree-tostring.go b/parser/tree-tostring.go
index 8e2685b..b6e9d64 100644
--- a/parser/tree-tostring.go
+++ b/parser/tree-tostring.go
@@ -95,7 +95,7 @@ func (what Type) ToString () (output string) {
 	return
 }
 
-func (declaration Declaration) ToString (indent int) (output string) {
+func (declaration Declaration) ToString () (output string) {
 	output += declaration.name + ":"
 	output += declaration.what.ToString()
 	return
@@ -142,7 +142,7 @@ func (argument Argument) ToString (indent int, breakLine bool) (output string) {
 	case ArgumentKindDeclaration:
 		output += doIndent (
 			indent,
-			argument.value.(Declaration).ToString(indent))
+			argument.value.(Declaration).ToString())
 		if breakLine { output += "\n" }
 	
 	case ArgumentKindInt, ArgumentKindUInt, ArgumentKindFloat:
@@ -260,11 +260,11 @@ func (behavior FaceBehavior) ToString (indent int) (output string) {
 	output += doIndent(indent, behavior.name, "\n")
 	
 	for _, inputItem := range behavior.inputs {
-		output += doIndent(indent + 1, "> ", inputItem.ToString(indent), "\n")
+		output += doIndent(indent + 1, "> ", inputItem.ToString(), "\n")
 	}
 	
 	for _, outputItem := range behavior.outputs {
-		output += doIndent(indent + 1, "< ", outputItem.ToString(indent), "\n")
+		output += doIndent(indent + 1, "< ", outputItem.ToString(), "\n")
 	}
 
 	return
@@ -280,7 +280,6 @@ func (phrase Phrase) ToString (indent int, ownLine bool) (output string) {
 	switch phrase.kind {
 	case
 		PhraseKindOperator,
-		PhraseKindLet,
 		PhraseKindAssign:
 		
 		switch phrase.operator {
@@ -373,6 +372,17 @@ func (phrase Phrase) ToString (indent int, ownLine bool) (output string) {
 	return
 }
 
+func (funcOutput FuncOutput) ToString (indent int) (output string) {
+	output += doIndent(indent + 1)
+	output += "< " + funcOutput.Declaration.ToString()
+	if funcOutput.argument.kind != ArgumentKindNil {
+		output += " " + funcOutput.argument.ToString(indent, false)
+	}
+	output += "\n"
+
+	return
+}
+
 func (block Block) ToString (indent int) (output string) {
 	for _, phrase := range block {
 		output += phrase.ToString(indent, true)
@@ -391,15 +401,15 @@ func (section FuncSection) ToString (indent int) (output string) {
 	if section.receiver != nil {
 		output += doIndent (
 			indent + 1,
-			"@ ", section.receiver.ToString(indent), "\n")
+			"@ ", section.receiver.ToString(), "\n")
 	}
 	
 	for _, inputItem := range section.inputs {
-		output += doIndent(indent + 1, "> ", inputItem.ToString(indent), "\n")
+		output += doIndent(indent + 1, "> ", inputItem.ToString(), "\n")
 	}
 	
 	for _, outputItem := range section.outputs {
-		output += doIndent(indent + 1, "< ", outputItem.ToString(indent), "\n")
+		output += outputItem.ToString(indent)
 	}
 
 	output += doIndent(indent + 1, "---\n")
diff --git a/parser/tree.go b/parser/tree.go
index ad935ab..c89b899 100644
--- a/parser/tree.go
+++ b/parser/tree.go
@@ -217,7 +217,6 @@ const (
 	PhraseKindCall = iota
 	PhraseKindCallExternal
 	PhraseKindOperator
-	PhraseKindLet
 	PhraseKindAssign
 	PhraseKindReference
 	PhraseKindDefer
diff --git a/tests/parser/func/main.arf b/tests/parser/func/main.arf
index 0f33b45..3c47e1c 100644
--- a/tests/parser/func/main.arf
+++ b/tests/parser/func/main.arf
@@ -124,11 +124,11 @@ func ro gControlFlow
 
 func ro hDataInit
 	---
-	let x:Int 3
+	= x:Int 3
 	# loc is a reference, similar to * in C
-	let y:{Int} [loc x]
-	let z:Int:8 (398 9 2309 983 -2387
+	= y:{Int} [loc x]
+	= z:Int:8 (398 9 2309 983 -2387
 		478 555 123)
-	let bird:Bird (
+	= bird:Bird (
 		(99999)
 		324)