fix: parsing error when combining single line directive with multi-line directive in use rule statements

snakemake/parser.py

@@ -1129,7 +1129,7 @@ def block_content(self, token):
                 )
             except StopAutomaton as e:
                 self.indentation(e.token)
-                self.block(e.token)
+                yield from self.block(e.token)
         else:
             self.error(
                 "Expecting a keyword or comment "

tests/test_github_issue1618/Snakefile

@@ -0,0 +1,19 @@
+rule all:
+    input:
+        "test2.out",
+
+
+rule a:
+    output:
+        "test.out",
+    threads: 4
+    shell:
+        """
+        echo {threads} > {output}
+        """
+
+
+use rule a as b with:
+    threads: 5
+    output:
+        "test2.out",

tests/test_github_issue1618/expected-results/test2.out

@@ -0,0 +1 @@
+5

tests/tests.py

@@ -1644,3 +1644,8 @@ def test_rule_inheritance_globals():
 
 def test_retries():
     run(dpath("test_retries"))
+
+
+@skip_on_windows  # sufficient to test this on linux
+def test_github_issue1618():
+    run(dpath("test_github_issue1618"), cores=5)