Do not permit invalid and/or nodes to be declared. Closes #1886.

3 files changed, 7 insertions, 0 deletions

diff --git a/mesonbuild/mparser.py b/mesonbuild/mparser.py
index 75985c3..8400a1a 100644
--- a/mesonbuild/mparser.py
+++ b/mesonbuild/mparser.py
@@ -475,12 +475,18 @@ class Parser:
     def e2(self):
         left = self.e3()
         while self.accept('or'):
+            if isinstance(left, EmptyNode):
+                raise ParseException('Invalid or clause.',
+                                     self.getline(), left.lineno, left.colno)
             left = OrNode(left, self.e3())
         return left
 
     def e3(self):
         left = self.e4()
         while self.accept('and'):
+            if isinstance(left, EmptyNode):
+                raise ParseException('Invalid and clause.',
+                                     self.getline(), left.lineno, left.colno)
             left = AndNode(left, self.e4())
         return left
 
@@ -633,6 +639,7 @@ class Parser:
     def ifblock(self):
         condition = self.statement()
         clause = IfClauseNode(condition.lineno, condition.colno)
+        self.expect('eol')
         block = self.codeblock()
         clause.ifs.append(IfNode(clause.lineno, clause.colno, condition, block))
         self.elseifblock(clause)
diff --git a/test cases/failing/55 or on new line/meson.build b/test cases/failing/57 or on new line/meson.build
index 12f2705..12f2705 100644
--- a/test cases/failing/55 or on new line/meson.build
+++ b/test cases/failing/57 or on new line/meson.build
diff --git a/test cases/failing/55 or on new line/meson_options.txt b/test cases/failing/57 or on new line/meson_options.txt
index 3302cf4..3302cf4 100644
--- a/test cases/failing/55 or on new line/meson_options.txt
+++ b/test cases/failing/57 or on new line/meson_options.txt