patch 9.0.1164: evaluating string expression advances function line
Problem: Evaluating string expression advances function line.
Solution: Disable function lines while parsing a string expression.
(Hirohito Higashi, closes #11796)
diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index 6354782..29a17fe 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -3700,6 +3700,17 @@
assert_equal('', v:errmsg)
END
v9.CheckScriptSuccess(lines)
+
+ # this was skipping over the expression without an error
+ lines =<< trim END
+ vim9script
+ def Test(s: string): string
+ return substitute(s, 'A', '\=toupper("x")', 'g')
+ ->tolower()
+ enddef
+ assert_equal('xbcd', Test('ABCD'))
+ END
+ v9.CheckScriptSuccess(lines)
enddef
def Test_expr9_method_call_import()