parser: support [unsafe] instead of [unsafe_fn] (#6066)

vlib/v/checker/tests/unsafe_pointer_arithmetic_should_be_checked.vv

@@ -16,7 +16,7 @@ fn test_ptr_infix() {
 
 struct S1 {}
 
-[unsafe_fn]
+[unsafe]
 fn (s S1) f(){}
 
 fn test_funcs() {

vlib/v/checker/tests/unsafe_required.vv

@@ -16,7 +16,7 @@ fn test_ptr_infix() {
 
 struct S1 {}
 
-[unsafe_fn]
+[unsafe]
 fn (s S1) f(){}
 
 fn test_funcs() {

vlib/v/parser/fn.v

@@ -132,7 +132,7 @@ fn (mut p Parser) fn_decl() ast.FnDecl {
 	p.top_level_statement_start()
 	start_pos := p.tok.position()
 	is_deprecated := p.attrs.contains('deprecated')
-	mut is_unsafe := p.attrs.contains('unsafe_fn')
+	mut is_unsafe := p.attrs.contains('unsafe')
 	is_pub := p.tok.kind == .key_pub
 	if is_pub {
 		p.next()

vlib/v/parser/parser.v

@@ -725,6 +725,12 @@ fn (mut p Parser) attributes() {
 }
 
 fn (mut p Parser) parse_attr() table.Attr {
+	if p.tok.kind == .key_unsafe {
+		p.next()
+		return table.Attr{
+			name: 'unsafe'
+		}
+	}
 	mut is_ctdefine := false
 	if p.tok.kind == .key_if {
 		p.next()
@@ -737,6 +743,10 @@ fn (mut p Parser) parse_attr() table.Attr {
 		p.next()
 	} else {
 		mut name = p.check_name()
+		if name == 'unsafe_fn' {
+			// p.error_with_pos('please use `[unsafe]` instead', p.tok.position())
+			name = 'unsafe'
+		}
 		if p.tok.kind == .colon {
 			name += ':'
 			p.next()

vlib/v/table/attr.v

@@ -3,7 +3,7 @@
 // that can be found in the LICENSE file.
 module table
 
-// e.g. `[unsafe_fn]`
+// e.g. `[unsafe]`
 pub struct Attr {
 pub:
 	name        string

vlib/v/tests/unsafe_test.v

@@ -33,7 +33,7 @@ fn test_ptr_infix() {
 struct S1 {
 }
 
-[unsafe_fn]
+[unsafe]
 fn (s S1) f() {
 }