| author |  Justus Klausecker <justus@klausecker.de> 2026-05-09 12:19:13+02:00 |
| committer |  Matthew Lugg <mlugg@mlugg.co.uk> 2026-06-11 12:08:45+02:00 |
| log | ffac200e66a493907270a02404bcd4ee1898eb3a |
| tree | a5e0e8033d84c0fc7af72b2c9172ac5f0d2425a3 |
| parent | 5537704f6061c7ea9f7bfb6302a380b04978e2ad |
AstGen: move check for primitive integer type with leading zero
Identifiers like `u0_` should be legal but were previously rejected because
they were spuriously interpreted as primitive integer type identifiers.
Now the integer is first parsed and only if that succeeds it's checked for
a leading zero.3 files changed, 26 insertions(+), 8 deletions(-)
lib- std
- zig
- test
- behavior
- cases
- compile_errors
lib/std/zig/AstGen.zig+8-8
| ... | ... | @@ -8069,14 +8069,6 @@ fn identifier( |
| 8069 | 8069 | if (std.mem.eql(u8, ident_name_raw, "i0")) { |
| 8070 | 8070 | return astgen.failNode(ident, "signed integer cannot have bit width 0", .{}); |
| 8071 | 8071 | } |
| 8072 | if (ident_name_raw[1] == '0') { | |
| 8073 | assert(ident_name_raw.len >= 3); // `u0` and `i0` handled | |
| 8074 | return astgen.failNode( | |
| 8075 | ident, | |
| 8076 | "primitive integer type '{s}' has leading zero", | |
| 8077 | .{ident_name_raw}, | |
| 8078 | ); | |
| 8079 | } | |
| 8080 | 8072 | const bit_count = parseBitCount(ident_name_raw[1..]) catch |err| switch (err) { |
| 8081 | 8073 | error.Overflow => return astgen.failNode( |
| 8082 | 8074 | ident, |
| ... | ... | @@ -8085,6 +8077,14 @@ fn identifier( |
| 8085 | 8077 | ), |
| 8086 | 8078 | error.InvalidCharacter => break :int_type, |
| 8087 | 8079 | }; |
| 8080 | if (ident_name_raw[1] == '0') { | |
| 8081 | assert(ident_name_raw.len >= 3); // `u0` and `i0` handled | |
| 8082 | return astgen.failNode( | |
| 8083 | ident, | |
| 8084 | "primitive integer type '{s}' has leading zero", | |
| 8085 | .{ident_name_raw}, | |
| 8086 | ); | |
| 8087 | } | |
| 8088 | 8088 | const result = try gz.add(.{ |
| 8089 | 8089 | .tag = .int_type, |
| 8090 | 8090 | .data = .{ .int_type = .{ |
test/behavior/basic.zig+11
| ... | ... | @@ -1437,3 +1437,14 @@ test "loading array from struct is not optimized away" { |
| 1437 | 1437 | var s = S{}; |
| 1438 | 1438 | try s.doTheTest(); |
| 1439 | 1439 | } |
| 1440 | ||
| 1441 | test "local variable name begins with primitive integer type" { | |
| 1442 | const u032_ = 123; | |
| 1443 | comptime assert(u032_ == 123); | |
| 1444 | ||
| 1445 | const u0_ = 456; | |
| 1446 | comptime assert(u0_ == 456); | |
| 1447 | ||
| 1448 | const i0_ = 789; | |
| 1449 | comptime assert(i0_ == 789); | |
| 1450 | } |
test/cases/compile_errors/primitive_integer_type_with_leading_zero.zig created+7
| ... | ... | @@ -0,0 +1,7 @@ |
| 1 | export fn entry1() void { | |
| 2 | _ = u032; | |
| 3 | } | |
| 4 | ||
| 5 | // error | |
| 6 | // | |
| 7 | // :2:9: error: primitive integer type 'u032' has leading zero |