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carbon-lang/toolchain/check/testdata/primitives/int_conversions.carbon
T
Richard Smith c297344937 Support conversion between integer types. (#6856) 
Add an `IntFitsIn` interface with a custom witness, such that `T impls
IntFitsIn(U)` if `T` is an integer type all of whose values fit
losslessly into the integer type `U`. Use it to constrain implicit
conversions between integer types.

So far, this has not been extended to the
`CppCompat.[U]{Long32,LongLong64}` types, only to `Core.Int(N)` and
`Core.UInt(N)`.

Assisted-by: Gemini 3 Pro via Antigravity
2026-03-10 01:40:16 +00:00

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// 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
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/full.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/primitives/int_conversions.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/primitives/int_conversions.carbon
// --- valid.carbon
library "[[@TEST_NAME]]";
fn TestFits() {
var a: i32 = 1;
var unused b: i64 = a;
var w: u32 = 1;
var unused x: u64 = w;
}
// --- fail_narrow.carbon
library "[[@TEST_NAME]]";
fn TestFailures() {
var a: i64 = 1;
// CHECK:STDERR: fail_narrow.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `i64` to `i32` [ConversionFailure]
// CHECK:STDERR: var unused b: i32 = a;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_narrow.carbon:[[@LINE+4]]:3: note: type `i64` does not implement interface `Core.ImplicitAs(i32)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: var unused b: i32 = a;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var unused b: i32 = a;
var w: u64 = 1;
// CHECK:STDERR: fail_narrow.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `u64` to `u32` [ConversionFailure]
// CHECK:STDERR: var unused x: u32 = w;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_narrow.carbon:[[@LINE+4]]:3: note: type `u64` does not implement interface `Core.ImplicitAs(u32)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: var unused x: u32 = w;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var unused x: u32 = w;
}
// --- cpp_compat.carbon
library "[[@TEST_NAME]]";
fn TestCppCompat() {
var c: i32 = 1;
var unused d: Core.CppCompat.Long32 = c;
}
// --- fail_todo_cpp_compat_widen.carbon
library "[[@TEST_NAME]]";
fn TestCppCompat() {
var a: Core.CppCompat.Long32 = 1;
// CHECK:STDERR: fail_todo_cpp_compat_widen.carbon:[[@LINE+11]]:17: error: bit width of integer type literal must be a multiple of 8; use `Core.Int(33)` instead [IntWidthNotMultipleOf8]
// CHECK:STDERR: var unused b: i33 = a;
// CHECK:STDERR: ^~~
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_cpp_compat_widen.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `Core.CppCompat.Long32` to `i33` [ConversionFailure]
// CHECK:STDERR: var unused b: i33 = a;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_todo_cpp_compat_widen.carbon:[[@LINE+4]]:3: note: type `Core.CppCompat.Long32` does not implement interface `Core.ImplicitAs(i33)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: var unused b: i33 = a;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var unused b: i33 = a;
var c: Core.CppCompat.LongLong64 = 1;
// CHECK:STDERR: fail_todo_cpp_compat_widen.carbon:[[@LINE+11]]:17: error: bit width of integer type literal must be a multiple of 8; use `Core.Int(65)` instead [IntWidthNotMultipleOf8]
// CHECK:STDERR: var unused d: i65 = c;
// CHECK:STDERR: ^~~
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_cpp_compat_widen.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `Core.CppCompat.LongLong64` to `i65` [ConversionFailure]
// CHECK:STDERR: var unused d: i65 = c;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_todo_cpp_compat_widen.carbon:[[@LINE+4]]:3: note: type `Core.CppCompat.LongLong64` does not implement interface `Core.ImplicitAs(i65)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: var unused d: i65 = c;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var unused d: i65 = c;
var e: Core.CppCompat.ULong32 = 1;
// CHECK:STDERR: fail_todo_cpp_compat_widen.carbon:[[@LINE+11]]:17: error: bit width of integer type literal must be a multiple of 8; use `Core.UInt(33)` instead [IntWidthNotMultipleOf8]
// CHECK:STDERR: var unused f: u33 = e;
// CHECK:STDERR: ^~~
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_cpp_compat_widen.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `Core.CppCompat.ULong32` to `u33` [ConversionFailure]
// CHECK:STDERR: var unused f: u33 = e;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_todo_cpp_compat_widen.carbon:[[@LINE+4]]:3: note: type `Core.CppCompat.ULong32` does not implement interface `Core.ImplicitAs(u33)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: var unused f: u33 = e;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var unused f: u33 = e;
var g: Core.CppCompat.ULongLong64 = 1;
// CHECK:STDERR: fail_todo_cpp_compat_widen.carbon:[[@LINE+11]]:17: error: bit width of integer type literal must be a multiple of 8; use `Core.UInt(65)` instead [IntWidthNotMultipleOf8]
// CHECK:STDERR: var unused h: u65 = g;
// CHECK:STDERR: ^~~
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_cpp_compat_widen.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `Core.CppCompat.ULongLong64` to `u65` [ConversionFailure]
// CHECK:STDERR: var unused h: u65 = g;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_todo_cpp_compat_widen.carbon:[[@LINE+4]]:3: note: type `Core.CppCompat.ULongLong64` does not implement interface `Core.ImplicitAs(u65)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: var unused h: u65 = g;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var unused h: u65 = g;
}
// --- fail_cpp_compat_narrow.carbon
library "[[@TEST_NAME]]";
fn TestCppCompat() {
// Long32 is slightly wider than i32.
var a: Core.CppCompat.Long32 = 1;
// CHECK:STDERR: fail_cpp_compat_narrow.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `Core.CppCompat.Long32` to `i32` [ConversionFailure]
// CHECK:STDERR: var unused b: i32 = a;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_cpp_compat_narrow.carbon:[[@LINE+4]]:3: note: type `Core.CppCompat.Long32` does not implement interface `Core.ImplicitAs(i32)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: var unused b: i32 = a;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var unused b: i32 = a;
// LongLong64 is slightly wider than i64.
var c: Core.CppCompat.LongLong64 = 1;
// CHECK:STDERR: fail_cpp_compat_narrow.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `Core.CppCompat.LongLong64` to `i64` [ConversionFailure]
// CHECK:STDERR: var unused d: i64 = c;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_cpp_compat_narrow.carbon:[[@LINE+4]]:3: note: type `Core.CppCompat.LongLong64` does not implement interface `Core.ImplicitAs(i64)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: var unused d: i64 = c;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var unused d: i64 = c;
// ULong32 is slightly wider than u32.
var e: Core.CppCompat.ULong32 = 1;
// CHECK:STDERR: fail_cpp_compat_narrow.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `Core.CppCompat.ULong32` to `u32` [ConversionFailure]
// CHECK:STDERR: var unused f: u32 = e;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_cpp_compat_narrow.carbon:[[@LINE+4]]:3: note: type `Core.CppCompat.ULong32` does not implement interface `Core.ImplicitAs(u32)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: var unused f: u32 = e;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var unused f: u32 = e;
// ULongLong64 is slightly wider than u64.
var g: Core.CppCompat.ULongLong64 = 1;
// CHECK:STDERR: fail_cpp_compat_narrow.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `Core.CppCompat.ULongLong64` to `u64` [ConversionFailure]
// CHECK:STDERR: var unused h: u64 = g;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_cpp_compat_narrow.carbon:[[@LINE+4]]:3: note: type `Core.CppCompat.ULongLong64` does not implement interface `Core.ImplicitAs(u64)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: var unused h: u64 = g;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var unused h: u64 = g;
}
// --- widen_sign_change.carbon
library "[[@TEST_NAME]]";
fn TestWidenSign() {
var e: u32 = 1;
var unused f: i64 = e;
}
// --- fail_narrow_sign_change.carbon
library "[[@TEST_NAME]]";
fn TestMixedSign() {
var a: i32 = 1;
// CHECK:STDERR: fail_narrow_sign_change.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `i32` to `u32` [ConversionFailure]
// CHECK:STDERR: var unused b: u32 = a;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_narrow_sign_change.carbon:[[@LINE+4]]:3: note: type `i32` does not implement interface `Core.ImplicitAs(u32)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: var unused b: u32 = a;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var unused b: u32 = a;
var c: u32 = 1;
// CHECK:STDERR: fail_narrow_sign_change.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `u32` to `i32` [ConversionFailure]
// CHECK:STDERR: var unused d: i32 = c;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_narrow_sign_change.carbon:[[@LINE+4]]:3: note: type `u32` does not implement interface `Core.ImplicitAs(i32)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: var unused d: i32 = c;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var unused d: i32 = c;
var g: i32 = 1;
// CHECK:STDERR: fail_narrow_sign_change.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `i32` to `u64` [ConversionFailure]
// CHECK:STDERR: var unused h: u64 = g;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_narrow_sign_change.carbon:[[@LINE+4]]:3: note: type `i32` does not implement interface `Core.ImplicitAs(u64)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: var unused h: u64 = g;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var unused h: u64 = g;
}
// --- arbitrary_width.carbon
library "[[@TEST_NAME]]";
fn TestArbitraryWidth() {
var a: Core.Int(33) = 1;
var unused c: Core.Int(34) = a;
var d: Core.UInt(33) = 1;
var unused f: Core.UInt(34) = d;
var unused h: Core.Int(34) = d;
}
// --- fail_narrow_arbitrary_width.carbon
library "[[@TEST_NAME]]";
fn TestArbitraryWidth() {
var a: Core.Int(33) = 1;
// CHECK:STDERR: fail_narrow_arbitrary_width.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `i33` to `i32` [ConversionFailure]
// CHECK:STDERR: var unused b: Core.Int(32) = a;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_narrow_arbitrary_width.carbon:[[@LINE+4]]:3: note: type `i33` does not implement interface `Core.ImplicitAs(i32)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: var unused b: Core.Int(32) = a;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var unused b: Core.Int(32) = a;
var d: Core.UInt(33) = 1;
// CHECK:STDERR: fail_narrow_arbitrary_width.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `u33` to `u32` [ConversionFailure]
// CHECK:STDERR: var unused e: Core.UInt(32) = d;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_narrow_arbitrary_width.carbon:[[@LINE+4]]:3: note: type `u33` does not implement interface `Core.ImplicitAs(u32)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: var unused e: Core.UInt(32) = d;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var unused e: Core.UInt(32) = d;
// CHECK:STDERR: fail_narrow_arbitrary_width.carbon:[[@LINE+7]]:3: error: cannot implicitly convert expression of type `i33` to `u34` [ConversionFailure]
// CHECK:STDERR: var unused g: Core.UInt(34) = a;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_narrow_arbitrary_width.carbon:[[@LINE+4]]:3: note: type `i33` does not implement interface `Core.ImplicitAs(u34)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: var unused g: Core.UInt(34) = a;
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
var unused g: Core.UInt(34) = a;
}
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