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add compile error for casting const array to mutable slice

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See #1565
This commit is contained in:
Andrew Kelley 2018-09-20 12:24:51 -04:00
parent f8fe517d12
commit 9c8dfadbb1
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GPG key ID: 4E7CD66038A4D47C
2 changed files with 15 additions and 2 deletions
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7
src/ir.cpp
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@ -10838,8 +10838,11 @@ static IrInstruction *ir_analyze_cast(IrAnalyze *ira, IrInstruction *source_inst
{
ZigType *slice_ptr_type = wanted_type->data.structure.fields[slice_ptr_index].type_entry;
assert(slice_ptr_type->id == ZigTypeIdPointer);
if (types_match_const_cast_only(ira, slice_ptr_type->data.pointer.child_type,
actual_type->data.pointer.child_type->data.array.child_type, source_node,
ZigType *array_type = actual_type->data.pointer.child_type;
bool const_ok = (slice_ptr_type->data.pointer.is_const || array_type->data.array.len == 0
|| !actual_type->data.pointer.is_const);
if (const_ok && types_match_const_cast_only(ira, slice_ptr_type->data.pointer.child_type,
array_type->data.array.child_type, source_node,
!slice_ptr_type->data.pointer.is_const).id == ConstCastResultIdOk)
{
return ir_resolve_ptr_of_array_to_slice(ira, source_instr, value, wanted_type);

10
test/compile_errors.zig
View file

@ -1,6 +1,16 @@
const tests = @import("tests.zig");
pub fn addCases(cases: *tests.CompileErrorContext) void {
cases.add(
"implicit cast const array to mutable slice",
\\export fn entry() void {
\\ const buffer: [1]u8 = []u8{8};
\\ const sliceA: []u8 = &buffer;
\\}
,
".tmp_source.zig:3:27: error: expected type '[]u8', found '*const [1]u8'",
);
cases.add(
"deref slice and get len field",
\\export fn entry() void {