carbon-lang/toolchain/parse/testdata/let/expression_pattern_precedence.carbon

// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/parse/testdata/let/expression_pattern_precedence.carbon
// TIP: To dump output, run:
// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/parse/testdata/let/expression_pattern_precedence.carbon

// --- parens.carbon

fn F() {
  let (a == b) = c;

  let (a and b) = c;

  let (if true then 1 else 2) = 3;
}

// --- fail_relational.carbon

fn G() {
  // CHECK:STDERR: fail_relational.carbon:[[@LINE+4]]:9: error: `let` declarations must end with a `;` [ExpectedDeclSemi]
  // CHECK:STDERR:   let a == b = c;
  // CHECK:STDERR:         ^~
  // CHECK:STDERR:
  let a == b = c;
}

// --- fail_logical.carbon

fn H() {
  // CHECK:STDERR: fail_logical.carbon:[[@LINE+4]]:9: error: `let` declarations must end with a `;` [ExpectedDeclSemi]
  // CHECK:STDERR:   let a and b = c;
  // CHECK:STDERR:         ^~~
  // CHECK:STDERR:
  let a and b = c;
}

// --- fail_if.carbon

fn I() {
  // CHECK:STDERR: fail_if.carbon:[[@LINE+4]]:7: error: parentheses are required around this unary `if` operator [UnaryOperatorRequiresParentheses]
  // CHECK:STDERR:   let if true then 1 else 2 = 3;
  // CHECK:STDERR:       ^~
  // CHECK:STDERR:
  let if true then 1 else 2 = 3;
}

// CHECK:STDOUT: - filename: parens.carbon
// CHECK:STDOUT:   parse_tree: [
// CHECK:STDOUT:     {kind: 'FileStart', text: ''},
// CHECK:STDOUT:         {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT:         {kind: 'IdentifierNameMaybeBeforeSignature', text: 'F'},
// CHECK:STDOUT:           {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT:         {kind: 'ExplicitParamList', text: ')', subtree_size: 2},
// CHECK:STDOUT:       {kind: 'FunctionDefinitionStart', text: '{', subtree_size: 5},
// CHECK:STDOUT:         {kind: 'LetIntroducer', text: 'let'},
// CHECK:STDOUT:           {kind: 'TuplePatternStart', text: '('},
// CHECK:STDOUT:             {kind: 'IdentifierNameExpr', text: 'a'},
// CHECK:STDOUT:             {kind: 'IdentifierNameExpr', text: 'b'},
// CHECK:STDOUT:           {kind: 'InfixOperatorEqualEqual', text: '==', subtree_size: 3},
// CHECK:STDOUT:         {kind: 'ParenPattern', text: ')', subtree_size: 5},
// CHECK:STDOUT:         {kind: 'LetInitializer', text: '='},
// CHECK:STDOUT:         {kind: 'IdentifierNameExpr', text: 'c'},
// CHECK:STDOUT:       {kind: 'LetDecl', text: ';', subtree_size: 9},
// CHECK:STDOUT:         {kind: 'LetIntroducer', text: 'let'},
// CHECK:STDOUT:           {kind: 'TuplePatternStart', text: '('},
// CHECK:STDOUT:               {kind: 'IdentifierNameExpr', text: 'a'},
// CHECK:STDOUT:             {kind: 'ShortCircuitOperandAnd', text: 'and', subtree_size: 2},
// CHECK:STDOUT:             {kind: 'IdentifierNameExpr', text: 'b'},
// CHECK:STDOUT:           {kind: 'ShortCircuitOperatorAnd', text: 'and', subtree_size: 4},
// CHECK:STDOUT:         {kind: 'ParenPattern', text: ')', subtree_size: 6},
// CHECK:STDOUT:         {kind: 'LetInitializer', text: '='},
// CHECK:STDOUT:         {kind: 'IdentifierNameExpr', text: 'c'},
// CHECK:STDOUT:       {kind: 'LetDecl', text: ';', subtree_size: 10},
// CHECK:STDOUT:         {kind: 'LetIntroducer', text: 'let'},
// CHECK:STDOUT:           {kind: 'TuplePatternStart', text: '('},
// CHECK:STDOUT:               {kind: 'BoolLiteralTrue', text: 'true'},
// CHECK:STDOUT:             {kind: 'IfExprIf', text: 'if', subtree_size: 2},
// CHECK:STDOUT:               {kind: 'IntLiteral', text: '1'},
// CHECK:STDOUT:             {kind: 'IfExprThen', text: 'then', subtree_size: 2},
// CHECK:STDOUT:             {kind: 'IntLiteral', text: '2'},
// CHECK:STDOUT:           {kind: 'IfExprElse', text: 'else', subtree_size: 6},
// CHECK:STDOUT:         {kind: 'ParenPattern', text: ')', subtree_size: 8},
// CHECK:STDOUT:         {kind: 'LetInitializer', text: '='},
// CHECK:STDOUT:         {kind: 'IntLiteral', text: '3'},
// CHECK:STDOUT:       {kind: 'LetDecl', text: ';', subtree_size: 12},
// CHECK:STDOUT:     {kind: 'FunctionDefinition', text: '}', subtree_size: 37},
// CHECK:STDOUT:     {kind: 'FileEnd', text: ''},
// CHECK:STDOUT:   ]
// CHECK:STDOUT: - filename: fail_relational.carbon
// CHECK:STDOUT:   parse_tree: [
// CHECK:STDOUT:     {kind: 'FileStart', text: ''},
// CHECK:STDOUT:         {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT:         {kind: 'IdentifierNameMaybeBeforeSignature', text: 'G'},
// CHECK:STDOUT:           {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT:         {kind: 'ExplicitParamList', text: ')', subtree_size: 2},
// CHECK:STDOUT:       {kind: 'FunctionDefinitionStart', text: '{', subtree_size: 5},
// CHECK:STDOUT:         {kind: 'LetIntroducer', text: 'let'},
// CHECK:STDOUT:         {kind: 'IdentifierNameExpr', text: 'a'},
// CHECK:STDOUT:       {kind: 'LetDecl', text: ';', has_error: yes, subtree_size: 3},
// CHECK:STDOUT:     {kind: 'FunctionDefinition', text: '}', subtree_size: 9},
// CHECK:STDOUT:     {kind: 'FileEnd', text: ''},
// CHECK:STDOUT:   ]
// CHECK:STDOUT: - filename: fail_logical.carbon
// CHECK:STDOUT:   parse_tree: [
// CHECK:STDOUT:     {kind: 'FileStart', text: ''},
// CHECK:STDOUT:         {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT:         {kind: 'IdentifierNameMaybeBeforeSignature', text: 'H'},
// CHECK:STDOUT:           {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT:         {kind: 'ExplicitParamList', text: ')', subtree_size: 2},
// CHECK:STDOUT:       {kind: 'FunctionDefinitionStart', text: '{', subtree_size: 5},
// CHECK:STDOUT:         {kind: 'LetIntroducer', text: 'let'},
// CHECK:STDOUT:         {kind: 'IdentifierNameExpr', text: 'a'},
// CHECK:STDOUT:       {kind: 'LetDecl', text: ';', has_error: yes, subtree_size: 3},
// CHECK:STDOUT:     {kind: 'FunctionDefinition', text: '}', subtree_size: 9},
// CHECK:STDOUT:     {kind: 'FileEnd', text: ''},
// CHECK:STDOUT:   ]
// CHECK:STDOUT: - filename: fail_if.carbon
// CHECK:STDOUT:   parse_tree: [
// CHECK:STDOUT:     {kind: 'FileStart', text: ''},
// CHECK:STDOUT:         {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT:         {kind: 'IdentifierNameMaybeBeforeSignature', text: 'I'},
// CHECK:STDOUT:           {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT:         {kind: 'ExplicitParamList', text: ')', subtree_size: 2},
// CHECK:STDOUT:       {kind: 'FunctionDefinitionStart', text: '{', subtree_size: 5},
// CHECK:STDOUT:         {kind: 'LetIntroducer', text: 'let'},
// CHECK:STDOUT:             {kind: 'BoolLiteralTrue', text: 'true'},
// CHECK:STDOUT:           {kind: 'IfExprIf', text: 'if', subtree_size: 2},
// CHECK:STDOUT:             {kind: 'IntLiteral', text: '1'},
// CHECK:STDOUT:           {kind: 'IfExprThen', text: 'then', subtree_size: 2},
// CHECK:STDOUT:           {kind: 'IntLiteral', text: '2'},
// CHECK:STDOUT:         {kind: 'IfExprElse', text: 'else', subtree_size: 6},
// CHECK:STDOUT:         {kind: 'LetInitializer', text: '='},
// CHECK:STDOUT:         {kind: 'IntLiteral', text: '3'},
// CHECK:STDOUT:       {kind: 'LetDecl', text: ';', subtree_size: 10},
// CHECK:STDOUT:     {kind: 'FunctionDefinition', text: '}', subtree_size: 16},
// CHECK:STDOUT:     {kind: 'FileEnd', text: ''},
// CHECK:STDOUT:   ]