Remove deadcode (#146)

stack.go

@@ -145,43 +145,3 @@ func funcname(name string) string {
 	i = strings.Index(name, ".")
 	return name[i+1:]
 }
-
-func trimGOPATH(name, file string) string {
-	// Here we want to get the source file path relative to the compile time
-	// GOPATH. As of Go 1.6.x there is no direct way to know the compiled
-	// GOPATH at runtime, but we can infer the number of path segments in the
-	// GOPATH. We note that fn.Name() returns the function name qualified by
-	// the import path, which does not include the GOPATH. Thus we can trim
-	// segments from the beginning of the file path until the number of path
-	// separators remaining is one more than the number of path separators in
-	// the function name. For example, given:
-	//
-	//    GOPATH     /home/user
-	//    file       /home/user/src/pkg/sub/file.go
-	//    fn.Name()  pkg/sub.Type.Method
-	//
-	// We want to produce:
-	//
-	//    pkg/sub/file.go
-	//
-	// From this we can easily see that fn.Name() has one less path separator
-	// than our desired output. We count separators from the end of the file
-	// path until it finds two more than in the function name and then move
-	// one character forward to preserve the initial path segment without a
-	// leading separator.
-	const sep = "/"
-	goal := strings.Count(name, sep) + 2
-	i := len(file)
-	for n := 0; n < goal; n++ {
-		i = strings.LastIndex(file[:i], sep)
-		if i == -1 {
-			// not enough separators found, set i so that the slice expression
-			// below leaves file unmodified
-			i = -len(sep)
-			break
-		}
-	}
-	// get back to 0 or trim the leading separator
-	file = file[i+len(sep):]
-	return file
-}

stack_test.go

@@ -146,24 +146,6 @@ func TestFuncname(t *testing.T) {
 	}
 }
 
-func TestTrimGOPATH(t *testing.T) {
-	var tests = []struct {
-		Frame
-		want string
-	}{{
-		Frame(initpc),
-		"github.com/pkg/errors/stack_test.go",
-	}}
-
-	for i, tt := range tests {
-		pc := tt.Frame.pc()
-		fn := runtime.FuncForPC(pc)
-		file, _ := fn.FileLine(pc)
-		got := trimGOPATH(fn.Name(), file)
-		testFormatRegexp(t, i, got, "%s", tt.want)
-	}
-}
-
 func TestStackTrace(t *testing.T) {
 	tests := []struct {
 		err  error
@@ -171,24 +153,24 @@ func TestStackTrace(t *testing.T) {
 	}{{
 		New("ooh"), []string{
 			"github.com/pkg/errors.TestStackTrace\n" +
-				"\t.+/github.com/pkg/errors/stack_test.go:172",
+				"\t.+/github.com/pkg/errors/stack_test.go:154",
 		},
 	}, {
 		Wrap(New("ooh"), "ahh"), []string{
 			"github.com/pkg/errors.TestStackTrace\n" +
-				"\t.+/github.com/pkg/errors/stack_test.go:177", // this is the stack of Wrap, not New
+				"\t.+/github.com/pkg/errors/stack_test.go:159", // this is the stack of Wrap, not New
 		},
 	}, {
 		Cause(Wrap(New("ooh"), "ahh")), []string{
 			"github.com/pkg/errors.TestStackTrace\n" +
-				"\t.+/github.com/pkg/errors/stack_test.go:182", // this is the stack of New
+				"\t.+/github.com/pkg/errors/stack_test.go:164", // this is the stack of New
 		},
 	}, {
 		func() error { return New("ooh") }(), []string{
 			`github.com/pkg/errors.(func·009|TestStackTrace.func1)` +
-				"\n\t.+/github.com/pkg/errors/stack_test.go:187", // this is the stack of New
+				"\n\t.+/github.com/pkg/errors/stack_test.go:169", // this is the stack of New
 			"github.com/pkg/errors.TestStackTrace\n" +
-				"\t.+/github.com/pkg/errors/stack_test.go:187", // this is the stack of New's caller
+				"\t.+/github.com/pkg/errors/stack_test.go:169", // this is the stack of New's caller
 		},
 	}, {
 		Cause(func() error {
@@ -197,11 +179,11 @@ func TestStackTrace(t *testing.T) {
 			}()
 		}()), []string{
 			`github.com/pkg/errors.(func·010|TestStackTrace.func2.1)` +
-				"\n\t.+/github.com/pkg/errors/stack_test.go:196", // this is the stack of Errorf
+				"\n\t.+/github.com/pkg/errors/stack_test.go:178", // this is the stack of Errorf
 			`github.com/pkg/errors.(func·011|TestStackTrace.func2)` +
-				"\n\t.+/github.com/pkg/errors/stack_test.go:197", // this is the stack of Errorf's caller
+				"\n\t.+/github.com/pkg/errors/stack_test.go:179", // this is the stack of Errorf's caller
 			"github.com/pkg/errors.TestStackTrace\n" +
-				"\t.+/github.com/pkg/errors/stack_test.go:198", // this is the stack of Errorf's caller's caller
+				"\t.+/github.com/pkg/errors/stack_test.go:180", // this is the stack of Errorf's caller's caller
 		},
 	}}
 	for i, tt := range tests {
@@ -271,19 +253,19 @@ func TestStackTraceFormat(t *testing.T) {
 	}, {
 		stackTrace()[:2],
 		"%v",
-		`\[stack_test.go:225 stack_test.go:272\]`,
+		`\[stack_test.go:207 stack_test.go:254\]`,
 	}, {
 		stackTrace()[:2],
 		"%+v",
 		"\n" +
 			"github.com/pkg/errors.stackTrace\n" +
-			"\t.+/github.com/pkg/errors/stack_test.go:225\n" +
+			"\t.+/github.com/pkg/errors/stack_test.go:207\n" +
 			"github.com/pkg/errors.TestStackTraceFormat\n" +
-			"\t.+/github.com/pkg/errors/stack_test.go:276",
+			"\t.+/github.com/pkg/errors/stack_test.go:258",
 	}, {
 		stackTrace()[:2],
 		"%#v",
-		`\[\]errors.Frame{stack_test.go:225, stack_test.go:284}`,
+		`\[\]errors.Frame{stack_test.go:207, stack_test.go:266}`,
 	}}
 
 	for i, tt := range tests {