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diff --git a/tests/custom/00_syntax/05_block_nesting b/tests/custom/00_syntax/05_block_nesting
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+++ b/tests/custom/00_syntax/05_block_nesting
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+Nesting blocks into non-comment blocks should fail.
+
+-- Expect stderr --
+Syntax error: Template blocks may not be nested
+In line 2, byte 61:
+
+ `We may not nest statement blocks into expression blocks: {{ {% print(1 + 2) %} }}.`
+  Near here --------------------------------------------------^
+
+
+Syntax error: Template blocks may not be nested
+In line 3, byte 61:
+
+ `We may not nest expression blocks into statement blocks: {% {{ 1 + 2 }} %}.`
+  Near here --------------------------------------------------^
+
+
+-- End --
+
+-- Testcase --
+We can nest other block types into comments: {# {% {{ 1 + 2 }} %} #}
+We may not nest statement blocks into expression blocks: {{ {% print(1 + 2) %} }}.
+We may not nest expression blocks into statement blocks: {% {{ 1 + 2 }} %}.
+-- End --