fix(gnovm): set Loc Line on Decl (gnolang#2221)

Closes gnolang#2220
<!-- please provide a detailed description of the changes made in this
pull request. -->

<details><summary>Contributors' checklist...</summary>

- [ ] Added new tests, or not needed, or not feasible
- [ ] Provided an example (e.g. screenshot) to aid review or the PR is
self-explanatory
- [ ] Updated the official documentation or not needed
- [ ] No breaking changes were made, or a `BREAKING CHANGE: xxx` message
was included in the description
- [ ] Added references to related issues and PRs
- [ ] Provided any useful hints for running manual tests
- [ ] Added new benchmarks to [generated
graphs](https://gnoland.github.io/benchmarks), if any. More info
[here](https://github.com/gnolang/gno/blob/master/.benchmarks/README.md).
</details>

gnovm/cmd/gno/testdata/gno_test/lint_bad_import.txtar

@@ -16,4 +16,4 @@ func main() {
 
 -- stdout.golden --
 -- stderr.golden --
-bad_file.gno:1: unknown import path python (code=2).
+bad_file.gno:3: unknown import path python (code=2).

gnovm/cmd/gno/testdata/gno_test/test_with-native-fallback.txtar

@@ -4,7 +4,7 @@
 
 ! stdout .+
 stderr 'panic: unknown import path net \[recovered\]'
-stderr '	panic: gno.land/r/\w{8}/contract.gno:1: unknown import path net'
+stderr '	panic: gno.land/r/\w{8}/contract.gno:3: unknown import path net'
 
 gno test -v --with-native-fallback .
 

gnovm/cmd/gno/testdata/gno_test/unknow_lib.txtar

@@ -4,13 +4,13 @@
 
 ! stdout .+
 stderr 'panic: unknown import path foobarbaz \[recovered\]'
-stderr '	panic: gno.land/r/\w{8}/contract.gno:1: unknown import path foobarbaz'
+stderr '	panic: gno.land/r/\w{8}/contract.gno:3: unknown import path foobarbaz'
 
 ! gno test -v --with-native-fallback .
 
 ! stdout .+
 stderr 'panic: unknown import path foobarbaz \[recovered\]'
-stderr '	panic: gno.land/r/\w{8}/contract.gno:1: unknown import path foobarbaz'
+stderr '	panic: gno.land/r/\w{8}/contract.gno:3: unknown import path foobarbaz'
 
 -- contract.gno --
 package contract

gnovm/pkg/gnolang/debugger_test.go

@@ -117,14 +117,14 @@ func TestDebug(t *testing.T) {
 		{in: "p 'a'\n", out: "(97 int32)"},
 		{in: "p '界'\n", out: "(30028 int32)"},
 		{in: "p \"xxxx\"\n", out: `("xxxx" string)`},
-		{in: "si\n", out: "sample.gno:4"},
-		{in: "s\ns\n", out: "=>   33: 	num := 5"},
+		{in: "si\n", out: "sample.gno:14"},
+		{in: "s\ns\n", out: `=>   14: var global = "test"`},
 		{in: "s\n\n", out: "=>   33: 	num := 5"},
 		{in: "foo", out: "command not available: foo"},
 		{in: "\n\n", out: "dbg> "},
 		{in: "#\n", out: "dbg> "},
 		{in: "p foo", out: "Command failed: could not find symbol value for foo"},
-		{in: "b +7\nc\n", out: "=>   11:"},
+		{in: "b +7\nc\n", out: "=>   21: 	r := t.A[i]"},
 		{in: brk + "clear 0\n", out: "dbg> "},
 		{in: brk + "clear -1\n", out: "Command failed: invalid breakpoint id: -1"},
 		{in: brk + "clear\n", out: "dbg> "},

gnovm/pkg/gnolang/go2gno.go

@@ -767,6 +767,7 @@ func toDecls(fs *token.FileSet, gd *ast.GenDecl) (ds Decls) {
 					Const:     true,
 				}
 				cd.SetAttribute(ATTR_IOTA, si)
+				setLoc(fs, s.Pos(), cd)
 				ds = append(ds, cd)
 			} else {
 				var names []NameExpr
@@ -785,23 +786,27 @@ func toDecls(fs *token.FileSet, gd *ast.GenDecl) (ds Decls) {
 					Values:    values,
 					Const:     false,
 				}
+				setLoc(fs, s.Pos(), vd)
 				ds = append(ds, vd)
 			}
 		case *ast.ImportSpec:
 			path, err := strconv.Unquote(s.Path.Value)
 			if err != nil {
 				panic("unexpected import spec path type")
 			}
-			ds = append(ds, &ImportDecl{
+			im := &ImportDecl{
 				NameExpr: *Nx(toName(s.Name)),
 				PkgPath:  path,
-			})
+			}
+			setLoc(fs, s.Pos(), im)
+			ds = append(ds, im)
 		default:
 			panic(fmt.Sprintf(
 				"unexpected decl spec %v",
 				reflect.TypeOf(s)))
 		}
 	}
+
 	return ds
 }
 

gnovm/tests/files/const9.gno

@@ -14,4 +14,4 @@ func main() {
 }
 
 // Error:
-// main/files/const9.gno:1: constant definition loop with b
+// main/files/const9.gno:5: constant definition loop with b

gnovm/tests/files/import6.gno

@@ -7,4 +7,4 @@ func main() {
 }
 
 // Error:
-// github.com/gnolang/gno/_test/c2/c2.gno:1: import cycle detected: "github.com/gnolang/gno/_test/c1" (through [github.com/gnolang/gno/_test/c1 github.com/gnolang/gno/_test/c2])
+// github.com/gnolang/gno/_test/c2/c2.gno:3: import cycle detected: "github.com/gnolang/gno/_test/c1" (through [github.com/gnolang/gno/_test/c1 github.com/gnolang/gno/_test/c2])

gnovm/tests/files/var18.gno

@@ -0,0 +1,8 @@
+package main
+
+func main() {
+	a, b, c := 1, 2
+}
+
+// Error:
+// main/files/var18.gno:4: should not happen