fmt: do not write single line or blocks with multi line stmts (#8952)

vlib/v/builder/cc.v

@@ -794,10 +794,12 @@ fn (mut b Builder) cc_linux_cross() {
 	if b.pref.show_cc {
 		println(cc_cmd)
 	}
-	cc_res := os.exec(cc_cmd) or { os.Result{
+	cc_res := os.exec(cc_cmd) or {
+		os.Result{
 			exit_code: 1
 			output: 'no `cc` command found'
-	} }
+		}
+	}
 	if cc_res.exit_code != 0 {
 		println('Cross compilation for Linux failed (first step, cc). Make sure you have clang installed.')
 		verror(cc_res.output)

vlib/v/fmt/fmt.v

@@ -459,11 +459,10 @@ pub fn (mut f Fmt) stmt(node ast.Stmt) {
 }
 
 fn stmt_is_single_line(stmt ast.Stmt) bool {
-	match stmt {
-		ast.ExprStmt { return expr_is_single_line(stmt.expr) }
-		ast.Return { return true }
-		ast.AssignStmt { return true }
-		else { return false }
+	return match stmt {
+		ast.ExprStmt, ast.AssertStmt { expr_is_single_line(stmt.expr) }
+		ast.Return, ast.AssignStmt, ast.BranchStmt { true }
+		else { false }
 	}
 }
 
@@ -1065,7 +1064,7 @@ pub fn (mut f Fmt) or_expr(node ast.OrExpr) {
 			if node.stmts.len == 0 {
 				f.write(' or { }')
 				return
-			} else if node.stmts.len == 1 {
+			} else if node.stmts.len == 1 && stmt_is_single_line(node.stmts[0]) {
 				// the control stmts (return/break/continue...) print a newline inside them,
 				// so, since this'll all be on one line, trim any possible whitespace
 				str := f.stmt_str(node.stmts[0]).trim_space()

vlib/v/fmt/tests/or_keep.vv

@@ -18,3 +18,11 @@ fn unwrapped_single_line_if() {
 		println('Another stmt')
 	}
 }
+
+fn or_with_one_multi_line_stmt() {
+	b := or_func() or {
+		MyStruct{
+			val: 'xyz'
+		}
+	}
+}

vlib/v/fmt/tests/stmt_keep.vv

@@ -0,0 +1,8 @@
+fn single_line_stmts() {
+	// Wouldn't be the or-block's stmt be single line, the block would be written as multi line
+	foo() or { assert false }
+	for {
+		foo() or { break }
+	}
+	foo() or { return }
+}