Drop name-less label/break for now

See #734 and #658.

tests/all.test

@@ -247,10 +247,6 @@ null
 1
 [1,2,4,8,16,32,64]
 
-[label | while(.<100; .*2|if . > 10 then break else . end)]
-1
-[1,2,4,8]
-
 [(label $here | .[] | if .>1 then break $here else . end), "hi!"]
 [0,1,2]
 [0,1,"hi!"]
@@ -259,14 +255,6 @@ null
 [0,2,1]
 [0,"hi!"]
 
-(label | (label | 2 | break2)), 1
-null
-1
-
-%%FAIL
-break
-jq: error: break used outside labeled control structure
-
 %%FAIL
 . as $foo | break $foo
 jq: error: *label-foo/0 is not defined
@@ -275,7 +263,7 @@ jq: error: *label-foo/0 is not defined
 [1,2,3,4,5]
 [1,2,6,24,120]
 
-[label | foreach .[] as $item ([3, null]; if .[0] < 1 then break else [.[0] -1, $item] end; .[1])]
+[label $out | foreach .[] as $item ([3, null]; if .[0] < 1 then break $out else [.[0] -1, $item] end; .[1])]
 [11,22,33,44,55,66,77,88,99]
 [11,22,33]