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Sema: add error note for wrong pointer dereference syntax

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Closes #1897
This commit is contained in:
Veikka Tuominen 2022-10-28 15:33:32 +03:00
parent 20925b2f5c
commit 61f5ea4c9a
2 changed files with 22 additions and 1 deletions
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12
src/Sema.zig
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@ -16612,7 +16612,17 @@ fn zirPtrType(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!Air
const bitoffset_src: LazySrcLoc = .{ .node_offset_ptr_bitoffset = extra.data.src_node }; const bitoffset_src: LazySrcLoc = .{ .node_offset_ptr_bitoffset = extra.data.src_node };
const hostsize_src: LazySrcLoc = .{ .node_offset_ptr_hostsize = extra.data.src_node }; const hostsize_src: LazySrcLoc = .{ .node_offset_ptr_hostsize = extra.data.src_node };
const unresolved_elem_ty = try sema.resolveType(block, elem_ty_src, extra.data.elem_type); const unresolved_elem_ty = blk: {
const air_inst = try sema.resolveInst(extra.data.elem_type);
const ty = sema.analyzeAsType(block, elem_ty_src, air_inst) catch |err| {
if (err == error.AnalysisFail and sema.err != null and sema.typeOf(air_inst).isSinglePointer()) {
try sema.errNote(block, elem_ty_src, sema.err.?, "use '.*' to dereference pointer", .{});
}
return err;
};
if (ty.tag() == .generic_poison) return error.GenericPoison;
break :blk ty;
};
const target = sema.mod.getTarget(); const target = sema.mod.getTarget();
var extra_i = extra.end; var extra_i = extra.end;

11
test/cases/compile_errors/incorrect_pointer_dereference_syntax.zig Normal file
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@ -0,0 +1,11 @@
pub export fn entry() void {
var a: *u32 = undefined;
_ = *a;
}
// error
// backend=stage2
// target=native
//
// :3:10: error: expected type 'type', found '*u32'
// :3:10: note: use '.*' to dereference pointer