[dev.typeparams] test: rename blank functions

This CL renames blank functions in the test/ directory so that they
don't rely on the compiler doing anything more than typechecking them.

In particular, I ran this search to find files that used blank
functions and methods:

$ git grep -l '^func.*\b_(' | xargs grep -n '^' | grep '\.go:1:' | grep -v '// errorcheck$'

I then skipped updating a few files:

* blank.go
* fixedbugs/issue11699.go
* fixedbugs/issue29870.go

  These tests specifically check that blank functions/methods work.

* interface/fail.go

  Not sure the motivation for the blank method here, but it's empty
  anyway.

* typeparam/tparam1.go

  Type-checking test, but uses "-G" (to use types2 instead of typecheck).

Updates #47446.

Change-Id: I9ec1714f499808768bd0dcd7ae6016fb2b078e5e
Reviewed-on: https://go-review.googlesource.com/c/go/+/338094
Trust: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>

test/escape5.go

@@ -173,13 +173,13 @@ type U int
 func (*U) M()   {}
 func (_ *U) N() {}
 
-func _() {
+func fbad24305a() {
 	var u U
 	u.M()
 	u.N()
 }
 
-func fbad24305() {
+func fbad24305b() {
 	var u U
 	(*U).M(&u)
 	(*U).N(&u)

test/escape_goto.go

@@ -10,7 +10,7 @@ package escape
 
 var x bool
 
-func _() {
+func f1() {
 	var p *int
 loop:
 	if x {
@@ -22,7 +22,7 @@ loop:
 	_ = p
 }
 
-func _() {
+func f2() {
 	var p *int
 	if x {
 	loop:
@@ -33,7 +33,7 @@ func _() {
 	_ = p
 }
 
-func _() {
+func f3() {
 	var p *int
 	if x {
 	loop:

test/fixedbugs/bug267.go

@@ -10,7 +10,7 @@ type T []int
 
 var a []bool
 
-func _() {
+func f1() {
 	if a[T{42}[0]] {
 	}
 	// if (a[T{42}[0]]) {}  // this compiles

test/fixedbugs/issue22076.go

@@ -13,12 +13,12 @@ import . "bytes"
 
 var _ Reader // use "bytes" import
 
-func _() {
+func f1() {
 	Buffer := 0
 	_ = Buffer
 }
 
-func _() {
+func f2() {
 	for Buffer := range []int{} {
 		_ = Buffer
 	}

test/fixedbugs/issue27557.go

@@ -8,19 +8,19 @@ package p
 
 var sink interface{}
 
-func _() {
+func f1() {
 	var t T
 	f := t.noescape // ERROR "t.noescape does not escape"
 	f()
 }
 
-func _() {
+func f2() {
 	var t T       // ERROR "moved to heap"
 	f := t.escape // ERROR "t.escape does not escape"
 	f()
 }
 
-func _() {
+func f3() {
 	var t T        // ERROR "moved to heap"
 	f := t.returns // ERROR "t.returns does not escape"
 	sink = f()

test/fixedbugs/issue45258.go

@@ -22,7 +22,7 @@ func (r *impl) Foo() Barer {
 
 func (r *impl) Bar() {}
 
-func _() {
+func f1() {
 	var r Fooer = &impl{}
 	r.Foo().Bar()
 }

test/fixedbugs/issue8042.go

@@ -9,7 +9,7 @@
 
 package p
 
-func _() {
+func f1() {
 	goto L1
 	const x = 0
 L1:
@@ -18,7 +18,7 @@ L1:
 L2:
 }
 
-func _() {
+func f2() {
 	{
 		goto L1
 	}
@@ -31,7 +31,7 @@ L1:
 L2:
 }
 
-func _(d int) {
+func f3(d int) {
 	if d > 0 {
 		goto L1
 	} else {

test/fixedbugs/issue8761.go

@@ -10,17 +10,17 @@
 
 package p
 
-func _() {
+func f1() {
 	type C chan int
 	_ = [1][]C{[]C{make(chan int)}}
 }
 
-func _() {
+func f2() {
 	type C interface{}
 	_ = [1][]C{[]C{recover()}}
 }
 
-func _() {
+func f3() {
 	type C *int
 	_ = [1][]C{[]C{new(int)}}
 }

test/inline.go

@@ -49,7 +49,7 @@ func j(x int) int { // ERROR "can inline j"
 	}
 }
 
-func _() int { // ERROR "can inline _"
+func f2() int { // ERROR "can inline f2"
 	tmp1 := h
 	tmp2 := tmp1
 	return tmp2(0) // ERROR "inlining call to h"
@@ -167,7 +167,7 @@ func (T) meth(int, int) {} // ERROR "can inline T.meth"
 
 func k() (T, int, int) { return T{}, 0, 0 } // ERROR "can inline k"
 
-func _() { // ERROR "can inline _"
+func f3() { // ERROR "can inline f3"
 	T.meth(k()) // ERROR "inlining call to k" "inlining call to T.meth"
 	// ERRORAUTO "inlining call to T.meth"
 }

test/typeparam/issue45547.go

@@ -11,7 +11,7 @@ func f[T any]() (f, g T) { return f, g }
 // Tests for generic function instantiation on the right hande side of multi-value
 // assignments.
 
-func _() {
+func g() {
 	// Multi-value assignment within a function
 	var _, _ = f[int]()
 }

test/typeparam/typelist.go

@@ -69,14 +69,14 @@ func _[V any, T interface{ type map[string]V }](p T) V {
 // Cannot embed stand-alone type parameters. Disabled for now.
 /*
 func f0[A any, B interface{type C}, C interface{type D}, D interface{type A}](A, B, C, D)
-func _() {
+func f0x() {
         f := f0[string]
         f("a", "b", "c", "d")
         f0("a", "b", "c", "d")
 }
 
 func f1[A any, B interface{type A}](A, B)
-func _() {
+func f1x() {
         f := f1[int]
         f(int(0), int(0))
         f1(int(0), int(0))
@@ -86,7 +86,7 @@ func _() {
 */
 
 func f2[A any, B interface{ type []A }](_ A, _ B)
-func _() {
+func f2x() {
 	f := f2[byte]
 	f(byte(0), []byte{})
 	f2(byte(0), []byte{})
@@ -97,7 +97,7 @@ func _() {
 // Cannot embed stand-alone type parameters. Disabled for now.
 /*
 func f3[A any, B interface{type C}, C interface{type *A}](a A, _ B, c C)
-func _() {
+func f3x() {
 	f := f3[int]
 	var x int
 	f(x, &x, &x)
@@ -106,7 +106,7 @@ func _() {
 */
 
 func f4[A any, B interface{ type []C }, C interface{ type *A }](_ A, _ B, c C)
-func _() {
+func f4x() {
 	f := f4[int]
 	var x int
 	f(x, []*int{}, &x)
@@ -119,14 +119,14 @@ func f5[A interface {
 		c C
 	}
 }, B any, C interface{ type *B }](x B) A
-func _() {
+func f5x() {
 	x := f5(1.2)
 	var _ float64 = x.b
 	var _ float64 = *x.c
 }
 
 func f6[A any, B interface{ type struct{ f []A } }](B) A
-func _() {
+func f6x() {
 	x := f6(struct{ f []string }{})
 	var _ string = x
 }