diff --git a/analyzer/block.go b/analyzer/block.go
index 1e47aa4..4ad34e1 100644
--- a/analyzer/block.go
+++ b/analyzer/block.go
@@ -14,7 +14,10 @@ func (block Block) ToString (indent int) (output string) {
 	output += doIndent(indent, "block\n")
 
 	// TODO: variables
-	// TODO: phrases
+	
+	for _, phrase := range block.phrases {
+		output += phrase.ToString(indent + 1)
+	}
 	return
 }
 
@@ -27,5 +30,8 @@ func (analyzer *analysisOperation) analyzeBlock (
 	block Block,
 	err error,
 ) {
+	for _, inputPhrase := range inputBlock {
+		
+	}
 	return
 }
diff --git a/analyzer/func-section.go b/analyzer/func-section.go
index e51b16f..0244ff0 100644
--- a/analyzer/func-section.go
+++ b/analyzer/func-section.go
@@ -52,6 +52,9 @@ func (analyzer *analysisOperation) analyzeFuncSection () (
 	
 	if inputSection.External() {
 		outputSection.external = true
+		if inputSection.Root() != nil {
+			panic("invalid state: input func is external with non-nil root")
+		}
 			
 	} else {
 		outputSection.root, err = analyzer.analyzeBlock(inputSection.Root())