cmd/cue: support unsafe pointer in get go

Fixes #2641

Change-Id: Ie77cc7d326cdcc5980d0432e0caf3a6bb0de2c8e
Signed-off-by: Thomas Way <thomas@6f.io>
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1171292
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>

cmd/cue/cmd/get_go.go

@@ -1139,13 +1139,13 @@ func (e *extractor) makeType(expr types.Type) (result cueast.Expr) {
 		}
 
 	case *types.Basic:
-		switch t := x.String(); t {
-		case "uintptr":
+		switch x.Kind() {
+		case types.Uintptr, types.UnsafePointer:
 			return e.ident("uint64", false)
-		case "byte":
+		case types.Byte:
 			return e.ident("uint8", false)
 		default:
-			return e.ident(t, false)
+			return e.ident(x.String(), false)
 		}
 
 	case *types.Interface:

cmd/cue/cmd/testdata/script/get_go_types.txtar

@@ -12,6 +12,7 @@ cmp ./pkg3/pkg3_go_gen.cue ./pkg3/pkg3_go_gen.cue.golden
 cmp ./pkg1/file1_go_gen.cue ./pkg1/file1_go_gen.cue.golden
 cmp ./pkg1/alias_go_gen.cue ./pkg1/alias_go_gen.cue.golden
 cmp ./pkg2/pkg2_go_gen.cue ./pkg2/pkg2_go_gen.cue.golden
+cmp ./pkg4/pkg4_go_gen.cue ./pkg4/pkg4_go_gen.cue.golden
 
 # Verify dependencies did not change
 cmp go.mod go.mod.golden
@@ -414,3 +415,21 @@ package pkg3
 import "mod.test/pkg2:pkgtwo"
 
 #Barzer: pkgtwo.#Barzer
+-- pkg4/pkg4.go --
+package pkg4
+
+import "unsafe"
+
+type A struct {
+	UnsafePointer unsafe.Pointer
+}
+-- pkg4/pkg4_go_gen.cue.golden --
+// Code generated by cue get go. DO NOT EDIT.
+
+//cue:generate cue get go mod.test/pkg4
+
+package pkg4
+
+#A: {
+	UnsafePointer: uint64 @go(,unsafe.Pointer)
+}