v.parser: allow for if x { $if y {} } else {}, fix #10243 (#10294)

Author: Wertzui123

vlib/v/parser/if_match.v

@@ -134,7 +134,7 @@ fn (mut p Parser) if_expr(is_comptime bool) ast.IfExpr {
 				p.error('use `\$else` instead of `else` in compile-time `if` branches')
 				return ast.IfExpr{}
 			}
-			if p.peek_tok.kind == .key_else {
+			if p.tok.kind != .rcbr && p.peek_tok.kind == .key_else {
 				p.check(.dollar)
 			}
 		}

vlib/v/tests/comptime_if_test.v

@@ -0,0 +1,54 @@
+fn test_comptime_if_test() {
+	mut i := 0
+	$if test {
+		i++
+	}
+	$if !test {
+		i--
+	}
+	assert i == 1
+}
+
+fn test_comptime_if_parsing_in_combination_with_ordinary_if_1() {
+	if true {
+		$if debug {
+			println('debug')
+		}
+	} else {
+		assert false
+	}
+	assert true
+}
+
+fn test_comptime_if_parsing_in_combination_with_ordinary_if_2() {
+	if true {
+		if true {
+			$if debug {
+				println('debug')
+			}
+		} else {
+			assert false
+		}
+	} else {
+		assert false
+	}
+	assert true
+}
+
+fn test_comptime_if_parsing_in_combination_with_ordinary_if_3() {
+	println(@LINE)
+	$if true {
+		println(@LINE)
+		$if true {
+			println(@LINE)
+			$if debug {
+				println('debug')
+			}
+		} $else {
+			assert false
+		}
+	} $else {
+		assert false
+	}
+	assert true
+}