parser: support `static x := 42` in [unsafe] functions too

vlib/v/parser/assign.v

@@ -141,8 +141,8 @@ fn (mut p Parser) partial_assign_stmt(left []ast.Expr, left_comments []ast.Comme
 						iv := lx.info as ast.IdentVar
 						share = iv.share
 						if iv.is_static {
-							if !p.pref.translated && !p.pref.is_fmt {
+							if !p.pref.translated && !p.pref.is_fmt && !p.inside_unsafe_fn {
-								p.error_with_pos('static variables are supported only in -translated mode',
+								p.error_with_pos('static variables are supported only in -translated mode or in [unsafe] fn',
 									lx.pos)
 								return ast.Stmt{}
 							}
@@ -154,7 +154,7 @@ fn (mut p Parser) partial_assign_stmt(left []ast.Expr, left_comments []ast.Comme
 						name: lx.name
 						expr: if left.len == right.len { right[i] } else { ast.Expr{} }
 						share: share
-						is_mut: lx.is_mut || p.inside_for
+						is_mut: lx.is_mut || p.inside_for || is_static
 						pos: lx.pos
 					}
 					if p.pref.autofree {

vlib/v/parser/fn.v

@@ -361,7 +361,9 @@ fn (mut p Parser) fn_decl() ast.FnDecl {
 	body_start_pos := p.peek_tok.position()
 	if p.tok.kind == .lcbr {
 		p.inside_fn = true
+		p.inside_unsafe_fn = is_unsafe
 		stmts = p.parse_block_no_scope(true)
+		p.inside_unsafe_fn = false
 		p.inside_fn = false
 	}
 	if !no_body && are_args_type_only {

vlib/v/parser/parser.v

@@ -38,6 +38,7 @@ mut:
 	inside_or_expr    bool
 	inside_for        bool
 	inside_fn         bool // true even with implicit main
+	inside_unsafe_fn  bool // true when in fn, marked with `[unsafe]`
 	inside_str_interp bool
 	or_is_handled     bool         // ignore `or` in this expression
 	builtin_mod       bool         // are we in the `builtin` module?

vlib/v/tests/static_vars_test.v

@@ -0,0 +1,16 @@
+[unsafe]
+fn foo() int {
+	static x := 42
+	x++
+	return x
+}
+
+fn xfoo() int {
+	return unsafe { foo() }
+}
+
+fn test_static_vars_work() {
+	assert xfoo() == 43
+	assert xfoo() == 44
+	assert xfoo() == 45
+}