std.fmt: fully remove format string from format methods

Introduces `std.fmt.alt` which is a helper for calling alternate format
methods besides one named "format".

1 files changed, 4 insertions, 10 deletions

diff --git a/lib/std/math/big/int_test.zig b/lib/std/math/big/int_test.zig
index 0f688b359d..58f5a01a05 100644
--- a/lib/std/math/big/int_test.zig
+++ b/lib/std/math/big/int_test.zig
@@ -3813,14 +3813,8 @@ test "(BigInt) positive" {
     try a.pow(&a, 64 * @sizeOf(Limb) * 8);
     try b.sub(&a, &c);
 
-    const a_fmt = try std.fmt.allocPrintSentinel(testing.allocator, "{fd}", .{a}, 0);
-    defer testing.allocator.free(a_fmt);
-
-    const b_fmt = try std.fmt.allocPrintSentinel(testing.allocator, "{fd}", .{b}, 0);
-    defer testing.allocator.free(b_fmt);
-
-    try testing.expect(mem.eql(u8, a_fmt, "(BigInt)"));
-    try testing.expect(!mem.eql(u8, b_fmt, "(BigInt)"));
+    try testing.expectFmt("(BigInt)", "{f}", .{a.fmt(10, .lower)});
+    try testing.expectFmt("1044388881413152506691752710716624382579964249047383780384233483283953907971557456848826811934997558340890106714439262837987573438185793607263236087851365277945956976543709998340361590134383718314428070011855946226376318839397712745672334684344586617496807908705803704071284048740118609114467977783598029006686938976881787785946905630190260940599579453432823469303026696443059025015972399867714215541693835559885291486318237914434496734087811872639496475100189041349008417061675093668333850551032972088269550769983616369411933015213796825837188091833656751221318492846368125550225998300412344784862595674492194617023806505913245610825731835380087608622102834270197698202313169017678006675195485079921636419370285375124784014907159135459982790513399611551794271106831134090584272884279791554849782954323534517065223269061394905987693002122963395687782878948440616007412945674919823050571642377154816321380631045902916136926708342856440730447899971901781465763473223850267253059899795996090799469201774624817718449867455659250178329070473119433165550807568221846571746373296884912819520317457002440926616910874148385078411929804522981857338977648103126085903001302413467189726673216491511131602920781738033436090243804708340403154190335", "{f}", .{b.fmt(10, .lower)});
 }
 
 test "(BigInt) negative" {
@@ -3838,10 +3832,10 @@ test "(BigInt) negative" {
     a.negate();
     try b.add(&a, &c);
 
-    const a_fmt = try std.fmt.allocPrintSentinel(testing.allocator, "{fd}", .{a}, 0);
+    const a_fmt = try std.fmt.allocPrint(testing.allocator, "{f}", .{a.fmt(10, .lower)});
     defer testing.allocator.free(a_fmt);
 
-    const b_fmt = try std.fmt.allocPrintSentinel(testing.allocator, "{fd}", .{b}, 0);
+    const b_fmt = try std.fmt.allocPrint(testing.allocator, "{f}", .{b.fmt(10, .lower)});
     defer testing.allocator.free(b_fmt);
 
     try testing.expect(mem.eql(u8, a_fmt, "(BigInt)"));