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astgen: errors for shadowing in loop captures

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This commit is contained in:
Jacob G-W 2021-07-14 18:03:15 -04:00
parent 132b18e2b3
commit 759d1d9aef
2 changed files with 50 additions and 1 deletions
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8
src/AstGen.zig
View File

@ -5264,7 +5264,9 @@ fn whileExpr(
const ident_token = if (payload_is_ref) payload_token + 1 else payload_token;
if (mem.eql(u8, "_", tree.tokenSlice(ident_token)))
break :s &then_scope.base;
const ident_name = try astgen.identAsString(payload_token + @boolToInt(payload_is_ref));
const payload_name_loc = payload_token + @boolToInt(payload_is_ref);
const ident_name = try astgen.identAsString(payload_name_loc);
try astgen.detectLocalShadowing(&then_scope.base, ident_name, payload_name_loc);
payload_val_scope = .{
.parent = &then_scope.base,
.gen_zir = &then_scope,
@ -5287,6 +5289,7 @@ fn whileExpr(
const ident_name = try astgen.identAsString(ident_token);
if (mem.eql(u8, "_", tree.tokenSlice(ident_token)))
break :s &then_scope.base;
try astgen.detectLocalShadowing(&then_scope.base, ident_name, ident_token);
payload_val_scope = .{
.parent = &then_scope.base,
.gen_zir = &then_scope,
@ -5344,6 +5347,7 @@ fn whileExpr(
const ident_name = try astgen.identAsString(error_token);
if (mem.eql(u8, tree.tokenSlice(error_token), "_"))
break :s &else_scope.base;
try astgen.detectLocalShadowing(&else_scope.base, ident_name, error_token);
payload_val_scope = .{
.parent = &else_scope.base,
.gen_zir = &else_scope,
@ -5483,6 +5487,7 @@ fn forExpr(
const name_str_index = try astgen.identAsString(ident);
const tag: Zir.Inst.Tag = if (is_ptr) .elem_ptr else .elem_val;
const payload_inst = try then_scope.addBin(tag, array_ptr, index);
try astgen.detectLocalShadowing(&then_scope.base, name_str_index, ident);
payload_val_scope = .{
.parent = &then_scope.base,
.gen_zir = &then_scope,
@ -5506,6 +5511,7 @@ fn forExpr(
return astgen.failTok(index_token, "discard of index capture; omit it instead", .{});
}
const index_name = try astgen.identAsString(index_token);
try astgen.detectLocalShadowing(payload_sub_scope, index_name, index_token);
index_scope = .{
.parent = payload_sub_scope,
.gen_zir = &then_scope,

43
test/cases.zig
View File

@ -1065,6 +1065,49 @@ pub fn addCases(ctx: *TestContext) !void {
":5:19: error: redeclaration of local constant 'c'",
":4:19: note: previous declaration here",
});
case.addError(
\\pub fn main() void {
\\ var i = 0;
\\ for (n) |_, i| {
\\ }
\\}
, &[_][]const u8{
":3:17: error: redeclaration of local variable 'i'",
":2:9: note: previous declaration here",
});
case.addError(
\\pub fn main() void {
\\ var i = 0;
\\ for (n) |i| {
\\ }
\\}
, &[_][]const u8{
":3:14: error: redeclaration of local variable 'i'",
":2:9: note: previous declaration here",
});
case.addError(
\\pub fn main() void {
\\ var i = 0;
\\ while (n) |i| {
\\ }
\\}
, &[_][]const u8{
":3:16: error: redeclaration of local variable 'i'",
":2:9: note: previous declaration here",
});
case.addError(
\\pub fn main() void {
\\ var i = 0;
\\ while (n) |bruh| {
\\ _ = bruh;
\\ } else |i| {
\\
\\ }
\\}
, &[_][]const u8{
":5:13: error: redeclaration of local variable 'i'",
":2:9: note: previous declaration here",
});
}
{