compiler: fix segfault on parsing invalid pre/post increment expressions

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 18 insertions, 0 deletions

diff --git a/tests/custom/03_bugs/15_segfault_on_prefix_increment b/tests/custom/03_bugs/15_segfault_on_prefix_increment
new file mode 100644
index 0000000..280b680
--- /dev/null
+++ b/tests/custom/03_bugs/15_segfault_on_prefix_increment
@@ -0,0 +1,18 @@
+When parsing an invalid pre- or post-decrement expression as first
+statement of a source buffer, the compiler crashed while attempting
+to look up the type of the previous instruction within a not-yet
+allocated chunk buffer.
+
+-- Expect stderr --
+Syntax error: Unterminated string
+In line 1, byte 6:
+
+ `{% ++"`
+       ^-- Near here
+
+
+-- End --
+
+-- Testcase --
+{% ++"
+-- End --