skip appending path while variable argument evaluation (close #186)

cli/test.yaml

@@ -2135,6 +2135,14 @@
     [0,1]
     [[0,1],[0,1],[0,1],[0,1]]
 
+- name: function declaration with update operator
+  args:
+    - -c
+    - 'def f: def f($x): .; f(.x) | .x; f += f'
+  input: '{"x": 1}'
+  expected: |
+    {"x":2}
+
 - name: function declaration and recursive call
   args:
     - 'def f(g): if type == "array" then map(f(g * 2)) else g end; f(.)'
@@ -4754,6 +4762,15 @@
   error: |
     invalid path against: array ([])
 
+- name: path function with function declaration
+  args:
+    - 'def f($x): .y; path(f(.x))'
+  input: 'null'
+  expected: |
+    [
+      "y"
+    ]
+
 - name: path function with error function
   args:
     - '[path(error)]'

compiler.go

@@ -341,10 +341,12 @@ func (c *compiler) compileFuncDef(e *FuncDef, builtin bool) error {
 		}
 		for _, w := range vis {
 			c.append(&code{op: opload, v: v})
+			c.append(&code{op: opexpbegin})
 			c.append(&code{op: opload, v: w.index})
 			c.append(&code{op: opcallpc})
 			c.appendCodeInfo(w.name)
 			c.append(&code{op: opstore, v: c.pushVariable(w.name)})
+			c.append(&code{op: opexpend})
 		}
 		c.append(&code{op: opload, v: v})
 	}