all: formatting (#93)

Enforce stricter formatting and import grouping with gofumports.

internal/gen/ctors.go

@@ -27,6 +27,7 @@ func (c *ctors) Generate(is []inst.Instruction) ([]byte, error) {
 	c.Printf("package x86\n\n")
 	c.Printf("import (\n")
 	c.Printf("\t\"errors\"\n")
+	c.NL()
 	c.Printf("\tintrep \"%s/ir\"\n", pkg)
 	c.Printf("\t\"%s/reg\"\n", pkg)
 	c.Printf("\t\"%s/operand\"\n", pkg)

internal/gen/ctorstest.go

@@ -25,6 +25,7 @@ func (c *ctorstest) Generate(is []inst.Instruction) ([]byte, error) {
 	c.Printf("import (\n")
 	c.Printf("\t\"testing\"\n")
 	c.Printf("\t\"math\"\n")
+	c.NL()
 	c.Printf("\t\"%s/reg\"\n", pkg)
 	c.Printf("\t\"%s/operand\"\n", pkg)
 	c.Printf(")\n\n")

internal/gen/gen_test.go

@@ -3,7 +3,7 @@ package gen
 import "testing"
 
 func TestBuilderInterfaces(t *testing.T) {
-	var _ = []Builder{
+	_ = []Builder{
 		NewAsmTest,
 		NewGoData,
 		NewGoDataTest,

internal/gen/mov.go

@@ -28,6 +28,7 @@ func (m *mov) Generate(is []inst.Instruction) ([]byte, error) {
 
 	m.Printf("import (\n")
 	m.Printf("\t\"go/types\"\n")
+	m.NL()
 	m.Printf("\t\"%s/operand\"\n", pkg)
 	m.Printf(")\n\n")