parser: fix pointer cast expressions hack (#10777)

cmd/tools/vast/vast.v

@@ -1230,7 +1230,6 @@ fn (t Tree) cast_expr(node ast.CastExpr) &Node {
 	obj.add('typname', t.string_node(node.typname))
 	obj.add('expr_type', t.type_node(node.expr_type))
 	obj.add('has_arg', t.bool_node(node.has_arg))
-	obj.add('in_prexpr', t.bool_node(node.in_prexpr))
 	obj.add('pos', t.position(node.pos))
 	return obj
 }

vlib/net/address.v

@@ -185,8 +185,7 @@ pub fn resolve_ipaddrs(addr string, family AddrFamily, typ SocketType) ?[]Addr {
 
 	// This might look silly but is recommended by MSDN
 	$if windows {
-		socket_error(0 - C.getaddrinfo(&char(address.str), &char(sport.str), &hints,
-			&results)) ?
+		socket_error(0 - C.getaddrinfo(&char(address.str), &char(sport.str), &hints, &results)) ?
 	} $else {
 		x := C.getaddrinfo(&char(address.str), &char(sport.str), &hints, &results)
 		wrap_error(x) ?

vlib/sync/channels.v

@@ -637,8 +637,7 @@ pub fn channel_select(mut channels []&Channel, dir []Direction, mut objrefs []vo
 			}
 			subscr[i].prev = unsafe { &ch.read_subscriber }
 			unsafe {
-				subscr[i].nxt = C.atomic_exchange_ptr(&voidptr(&ch.read_subscriber),
-					&subscr[i])
+				subscr[i].nxt = C.atomic_exchange_ptr(&voidptr(&ch.read_subscriber), &subscr[i])
 			}
 			if voidptr(subscr[i].nxt) != voidptr(0) {
 				subscr[i].nxt.prev = unsafe { &subscr[i].nxt }

vlib/v/ast/ast.v

@@ -1106,7 +1106,6 @@ pub mut:
 	typname   string // TypeSymbol.name
 	expr_type Type   // `byteptr`
 	has_arg   bool
-	in_prexpr bool // is the parent node a PrefixExpr
 }
 
 pub struct AsmStmt {

vlib/v/checker/checker.v

@@ -5131,20 +5131,14 @@ pub fn (mut c Checker) cast_expr(mut node ast.CastExpr) ast.Type {
 	if to_type_sym.language != .c {
 		c.ensure_type_exists(node.typ, node.pos) or {}
 	}
-	n_e_t_idx := node.expr_type.idx()
-	expr_is_ptr := node.expr_type.is_ptr() || n_e_t_idx in ast.pointer_type_idxs
+	if from_type_sym.kind == .byte && node.expr_type.is_ptr() && to_type_sym.kind == .string
+		&& !node.typ.is_ptr() {
+		c.error('to convert a C string buffer pointer to a V string, use x.vstring() instead of string(x)',
+			node.pos)
+	}
 	if node.expr_type == ast.void_type {
 		c.error('expression does not return a value so it cannot be cast', node.expr.position())
 	}
-	if expr_is_ptr && to_type_sym.kind == .string && !node.in_prexpr {
-		if node.has_arg {
-			c.warn('to convert a C string buffer pointer to a V string, use x.vstring_with_len(len) instead of string(x,len)',
-				node.pos)
-		} else {
-			c.warn('to convert a C string buffer pointer to a V string, use x.vstring() instead of string(x)',
-				node.pos)
-		}
-	}
 	if node.expr_type == ast.byte_type && to_type_sym.kind == .string {
 		c.error('can not cast type `byte` to string, use `${node.expr.str()}.str()` instead.',
 			node.pos)

vlib/v/checker/tests/fixed_array_conv.out

@@ -12,11 +12,11 @@ vlib/v/checker/tests/fixed_array_conv.vv:5:4: error: mismatched types `&int` and
       |    ^
     6 | _ = &int(arr)
     7 | _ = p
-vlib/v/checker/tests/fixed_array_conv.vv:6:6: error: cannot cast a fixed array (use e.g. `&arr[0]` instead)
+vlib/v/checker/tests/fixed_array_conv.vv:6:5: error: cannot cast a fixed array (use e.g. `&arr[0]` instead)
     4 | mut ip := &int(0)
     5 | ip = arr
     6 | _ = &int(arr)
-      |      ~~~~~~~~
+      |     ~~~~~~~~~
     7 | _ = p
     8 | _ = ip
 vlib/v/checker/tests/fixed_array_conv.vv:11:13: error: cannot use `[2]int` as `voidptr` in argument 1 to `memdup`

vlib/v/checker/tests/warnings_for_string_c2v_calls.out

@@ -3,12 +3,5 @@ vlib/v/checker/tests/warnings_for_string_c2v_calls.vv:8:7: error: to convert a C
     7 |     }
     8 |     x := string(p)
       |          ~~~~~~~~~
-    9 |     y := string(p, 10)
-   10 |     eprintln('x: $x | y: $y')
-vlib/v/checker/tests/warnings_for_string_c2v_calls.vv:9:7: error: to convert a C string buffer pointer to a V string, use x.vstring_with_len(len) instead of string(x,len)
-    7 |     }
-    8 |     x := string(p)
-    9 |     y := string(p, 10)
-      |          ~~~~~~~~~~~~~
-   10 |     eprintln('x: $x | y: $y')
-   11 |     eprintln('x.len: $x.len | y.len: $y.len')
+    9 |     eprintln('x: $x')
+   10 |     eprintln('x.len: $x.len')

vlib/v/checker/tests/warnings_for_string_c2v_calls.vv

@@ -6,7 +6,6 @@ fn main() {
 		p[2] = `z`
 	}
 	x := string(p)
-	y := string(p, 10)
-	eprintln('x: $x | y: $y')
-	eprintln('x.len: $x.len | y.len: $y.len')
+	eprintln('x: $x')
+	eprintln('x.len: $x.len')
 }

vlib/v/parser/expr.v

@@ -560,7 +560,7 @@ fn (p &Parser) fileis(s string) bool {
 	return p.file_name.contains(s)
 }
 
-fn (mut p Parser) prefix_expr() ast.PrefixExpr {
+fn (mut p Parser) prefix_expr() ast.Expr {
 	mut pos := p.tok.position()
 	op := p.tok.kind
 	if op == .amp {
@@ -576,8 +576,11 @@ fn (mut p Parser) prefix_expr() ast.PrefixExpr {
 	p.next()
 	mut right := p.expr(int(token.Precedence.prefix))
 	p.is_amp = false
-	if mut right is ast.CastExpr {
-		right.in_prexpr = true
+	if mut right is ast.CastExpr && op == .amp {
+		return ast.CastExpr{
+			...right
+			pos: pos.extend(right.pos)
+		}
 	}
 	mut or_stmts := []ast.Stmt{}
 	mut or_kind := ast.OrKind.absent