From c89c67bef6aa3cc9eb7d75bbf26ef1e2c0fd449c Mon Sep 17 00:00:00 2001
From: Dmitri Plotnikov <dplotnikov@google.com>
Date: Fri, 28 Aug 2026 14:55:56 -0700
Subject: [PATCH] [Pratt parser] Fix operation precedence following negative
 numbers: `-42.foo`

PiperOrigin-RevId: 972804901
---
 parser/internal/pratt_parser_test.cc  | 33 +++++++++++++++++++++++++++
 parser/internal/pratt_parser_worker.h |  2 ++
 2 files changed, 35 insertions(+)

diff --git a/parser/internal/pratt_parser_test.cc b/parser/internal/pratt_parser_test.cc
index 6c85dd1d7..2db65b98e 100644
--- a/parser/internal/pratt_parser_test.cc
+++ b/parser/internal/pratt_parser_test.cc
@@ -482,6 +482,39 @@ std::vector<TestCase> GetParserTestCases() {
               )^#1:Expr.Call#
             )",
       },
+      TestCase{
+          .source = "-.2.V",
+          .expected_ast = R"(
+              -0.2^#1:double#.V^#2:Expr.Select#
+            )",
+      },
+      TestCase{
+          .source = "!-.2.V",
+          .expected_ast = R"(
+              !_(
+                -0.2^#2:double#.V^#3:Expr.Select#
+              )^#1:Expr.Call#
+            )",
+      },
+      TestCase{
+          .source = "!-2.V",
+          .expected_ast = R"(
+              !_(
+                -2^#2:int64#.V^#3:Expr.Select#
+              )^#1:Expr.Call#
+            )",
+      },
+      TestCase{
+          .source = "!-.2[0]",
+          .expected_ast = R"(
+              !_(
+                _[_](
+                  -0.2^#2:double#,
+                  0^#4:int64#
+                )^#3:Expr.Call#
+              )^#1:Expr.Call#
+            )",
+      },
       TestCase{
           .source = "a + b",
           .expected_ast = R"(
diff --git a/parser/internal/pratt_parser_worker.h b/parser/internal/pratt_parser_worker.h
index f4886aa90..1f99984c5 100644
--- a/parser/internal/pratt_parser_worker.h
+++ b/parser/internal/pratt_parser_worker.h
@@ -556,10 +556,12 @@ ExprNode PrattParserWorker<ExprNode>::ParseUnaryOpsChain(Token first_op) {
       int64_t op_id = ops.back().id;
       ops.pop_back();
       operand = ParseNegativeIntLiteral(op_id);
+      ParseSelectorChainTail(operand);
     } else if (peek_token_.type == TokenType::kFloat) {
       int64_t op_id = ops.back().id;
       ops.pop_back();
       operand = ParseNegativeDoubleLiteral(op_id);
+      ParseSelectorChainTail(operand);
     } else {
       operand = ParseSelectorChain();
     }