Relates #367: update unparam

$ git cherry -v cc9d2fb52971 fbb59629db34
+ 7362051ae01a0e35956c077c3be5505c70edd200 testdata: add more regression
tests
+ a88ca0234e2c3732a53cd49514fb3877a5d9f1f5 properly record which methods
implement interfaces
+ b762b0b27fa23ebbdfc31df1af4097cfd89a17f6 work properly with method
wrapper functions
+ f59bb08c5c7429b88e0c6e2399b12e71e8d950db testdata: consistently use
tabs
+ 46a5101c55d03117b263b4c5161e5d01353311c1 replace more callgraph code
with plain SSA
+ 1679b9996abdc6431c2147a133e5223ebb86ea60 rewrite foo(bar()) code to
work without callgraph
+ 71b5df77c291f8c5ead5f9ff0a69e0eebf3ae5b2 rewrite "called in return"
code without callgraph
+ fc5b1c74f563d4f2f9ee7d91eda648fc7baebf67 check: replace last use of
callgraph
+ 229ad68a599e2622cf9d3bb87a385b158efe736f fix a minor false negative in
callExtract
+ fbb59629db34a0f69275bc336cc8c3a4dd9fbe5d fix up another false negative
in testdata

Author: jirfag

go.mod

@@ -61,7 +61,7 @@ require (
 	gopkg.in/yaml.v2 v2.2.1
 	mvdan.cc/interfacer v0.0.0-20180901003855-c20040233aed
 	mvdan.cc/lint v0.0.0-20170908181259-adc824a0674b // indirect
-	mvdan.cc/unparam v0.0.0-20190124213536-cc9d2fb52971
+	mvdan.cc/unparam v0.0.0-20190124213536-fbb59629db34
 	sourcegraph.com/sourcegraph/go-diff v0.0.0-20171119081133-3f415a150aec
 	sourcegraph.com/sqs/pbtypes v0.0.0-20160107090929-4d1b9dc7ffc3 // indirect
 )

go.sum

@@ -173,8 +173,8 @@ mvdan.cc/interfacer v0.0.0-20180901003855-c20040233aed h1:WX1yoOaKQfddO/mLzdV4wp
 mvdan.cc/interfacer v0.0.0-20180901003855-c20040233aed/go.mod h1:Xkxe497xwlCKkIaQYRfC7CSLworTXY9RMqwhhCm+8Nc=
 mvdan.cc/lint v0.0.0-20170908181259-adc824a0674b h1:DxJ5nJdkhDlLok9K6qO+5290kphDJbHOQO1DFFFTeBo=
 mvdan.cc/lint v0.0.0-20170908181259-adc824a0674b/go.mod h1:2odslEg/xrtNQqCYg2/jCoyKnw3vv5biOc3JnIcYfL4=
-mvdan.cc/unparam v0.0.0-20190124213536-cc9d2fb52971 h1:INXoeng6RAblgAds8fdt2cAu1Bs/bgr5zq1fdYcuxMI=
-mvdan.cc/unparam v0.0.0-20190124213536-cc9d2fb52971/go.mod h1:H6SUd1XjIs+qQCyskXg5OFSrilMRUkD8ePJpHKDPaeY=
+mvdan.cc/unparam v0.0.0-20190124213536-fbb59629db34 h1:B1LAOfRqg2QUyCdzfjf46quTSYUTAK5OCwbh6pljHbM=
+mvdan.cc/unparam v0.0.0-20190124213536-fbb59629db34/go.mod h1:H6SUd1XjIs+qQCyskXg5OFSrilMRUkD8ePJpHKDPaeY=
 sourcegraph.com/sourcegraph/go-diff v0.0.0-20171119081133-3f415a150aec h1:wAAdENPXC7bE1oxY4VqSDdhaA+XQ8TgQHsZMMnrXjEk=
 sourcegraph.com/sourcegraph/go-diff v0.0.0-20171119081133-3f415a150aec/go.mod h1:R09mWeb9JcPbO+A3cYDc11xjz0wp6r9+KnqdqROAoRU=
 sourcegraph.com/sqs/pbtypes v0.0.0-20160107090929-4d1b9dc7ffc3 h1:hXy8YsgVLDz5mlngKhNHQhAsAGrSp3dlXZN4b0/4UUI=