COMMON: Fix square bracket field access issue

Author: chrisws

samples/distro-examples/tests/array.bas

@@ -321,4 +321,9 @@ dim j(0 to 1, 0 to 1)
 j[0, 0].translation = [1,2,3]
 k.framePoses = j
 anims << k
+sub xfunc(argx)
+  local xx=[1,2,3]
+  if xx!=argx then throw "err"
+end
 z=anims[0].framePoses[0, 0].translation
+xfunc(anims[0].framePoses[0, 0].translation)

src/common/scan.c

@@ -1110,6 +1110,10 @@ int comp_is_code_array(bc_t *bc, char *p) {
       }
       p++;
     }
+    if (*p == '.') {
+      // a[1].foo is not a code array
+      result = 0;
+    }
     if (!count) {
       result = 1;
     }