zig fmt: fix extra whitespace in StructInit with multiline strings

68d2f68 introduced special handling for StructInit fields
containing multiline strings to prevent inserting whitespace after =.
However, this logic didn't handle cases without a trailing comma,
which resulted in unwanted trailing whitespace.

Author: skewb1k

lib/std/zig/Ast/Render.zig

@@ -2056,7 +2056,8 @@ fn renderStructInit(
             const init_token = tree.firstToken(field_init);
             try renderToken(r, init_token - 3, .none); // .
             try renderIdentifier(r, init_token - 2, .space, .eagerly_unquote); // name
-            try renderToken(r, init_token - 1, .space); // =
+            const space_after_equal: Space = if (tree.nodeTag(field_init) == .multiline_string_literal) .none else .space;
+            try renderToken(r, init_token - 1, space_after_equal); // =
             try renderExpressionFixup(r, field_init, .comma_space);
         }
     }

lib/std/zig/parser_test.zig

@@ -5719,6 +5719,16 @@ test "zig fmt: no space before newline before multiline string" {
         \\        ,
         \\    };
         \\    _ = s2;
+        \\    const s3 = .{ .text =
+        \\        \\hello
+        \\        \\world
+        \\    , .comment = "test" };
+        \\    _ = s3;
+        \\    const s4 = .{ .comment = "test", .text =
+        \\        \\hello
+        \\        \\world
+        \\    };
+        \\    _ = s4;
         \\}
         \\
     );

test/link/elf.zig

@@ -480,7 +480,7 @@ fn testComdatElimination(b: *Build, opts: Options) *Step {
 fn testCommentString(b: *Build, opts: Options) *Step {
     const test_step = addTestStep(b, "comment-string", opts);
 
-    const exe = addExecutable(b, opts, .{ .name = "main", .zig_source_bytes = 
+    const exe = addExecutable(b, opts, .{ .name = "main", .zig_source_bytes =
         \\pub fn main() void {}
     });
 
@@ -495,7 +495,7 @@ fn testCommentString(b: *Build, opts: Options) *Step {
 fn testCommentStringStaticLib(b: *Build, opts: Options) *Step {
     const test_step = addTestStep(b, "comment-string-static-lib", opts);
 
-    const lib = addStaticLibrary(b, opts, .{ .name = "lib", .zig_source_bytes = 
+    const lib = addStaticLibrary(b, opts, .{ .name = "lib", .zig_source_bytes =
         \\export fn foo() void {}
     });
 
@@ -866,7 +866,7 @@ fn testDsoUndef(b: *Build, opts: Options) *Step {
 fn testEmitRelocatable(b: *Build, opts: Options) *Step {
     const test_step = addTestStep(b, "emit-relocatable", opts);
 
-    const a_o = addObject(b, opts, .{ .name = "a", .zig_source_bytes = 
+    const a_o = addObject(b, opts, .{ .name = "a", .zig_source_bytes =
         \\const std = @import("std");
         \\extern var bar: i32;
         \\export fn foo() i32 {
@@ -878,7 +878,7 @@ fn testEmitRelocatable(b: *Build, opts: Options) *Step {
     });
     a_o.root_module.link_libc = true;
 
-    const b_o = addObject(b, opts, .{ .name = "b", .c_source_bytes = 
+    const b_o = addObject(b, opts, .{ .name = "b", .c_source_bytes =
         \\#include <stdio.h>
         \\int bar = 42;
         \\void printBar() {
@@ -891,7 +891,7 @@ fn testEmitRelocatable(b: *Build, opts: Options) *Step {
     c_o.root_module.addObject(a_o);
     c_o.root_module.addObject(b_o);
 
-    const exe = addExecutable(b, opts, .{ .name = "test", .zig_source_bytes = 
+    const exe = addExecutable(b, opts, .{ .name = "test", .zig_source_bytes =
         \\const std = @import("std");
         \\extern fn printFoo() void;
         \\extern fn printBar() void;
@@ -1925,7 +1925,7 @@ fn testInitArrayOrder(b: *Build, opts: Options) *Step {
     });
     g_o.root_module.link_libc = true;
 
-    const h_o = addObject(b, opts, .{ .name = "h", .c_source_bytes = 
+    const h_o = addObject(b, opts, .{ .name = "h", .c_source_bytes =
         \\#include <stdio.h>
         \\__attribute__((destructor)) void fini2() { printf("8"); }
     });
@@ -2447,7 +2447,7 @@ fn testLinkingZig(b: *Build, opts: Options) *Step {
 fn testLinksection(b: *Build, opts: Options) *Step {
     const test_step = addTestStep(b, "linksection", opts);
 
-    const obj = addObject(b, opts, .{ .name = "main", .zig_source_bytes = 
+    const obj = addObject(b, opts, .{ .name = "main", .zig_source_bytes =
         \\export var test_global: u32 linksection(".TestGlobal") = undefined;
         \\export fn testFn() linksection(".TestFn") callconv(.c) void {
         \\    TestGenericFn("A").f();
@@ -2540,7 +2540,7 @@ fn testMergeStrings(b: *Build, opts: Options) *Step {
 fn testMergeStrings2(b: *Build, opts: Options) *Step {
     const test_step = addTestStep(b, "merge-strings2", opts);
 
-    const obj1 = addObject(b, opts, .{ .name = "a", .zig_source_bytes = 
+    const obj1 = addObject(b, opts, .{ .name = "a", .zig_source_bytes =
         \\const std = @import("std");
         \\export fn foo() void {
         \\    var arr: [5:0]u16 = [_:0]u16{ 1, 2, 3, 4, 5 };
@@ -2549,7 +2549,7 @@ fn testMergeStrings2(b: *Build, opts: Options) *Step {
         \\}
     });
 
-    const obj2 = addObject(b, opts, .{ .name = "b", .zig_source_bytes = 
+    const obj2 = addObject(b, opts, .{ .name = "b", .zig_source_bytes =
         \\const std = @import("std");
         \\extern fn foo() void;
         \\pub fn main() void {
@@ -2797,7 +2797,7 @@ fn testRelocatableEhFrame(b: *Build, opts: Options) *Step {
         ,
     });
     obj2.root_module.link_libcpp = true;
-    const obj3 = addObject(b, opts, .{ .name = "obj3", .cpp_source_bytes = 
+    const obj3 = addObject(b, opts, .{ .name = "obj3", .cpp_source_bytes =
         \\#include <iostream>
         \\#include <stdexcept>
         \\extern int try_again();
@@ -2909,7 +2909,7 @@ fn testRelocatableEhFrameComdatHeavy(b: *Build, opts: Options) *Step {
 fn testRelocatableMergeStrings(b: *Build, opts: Options) *Step {
     const test_step = addTestStep(b, "relocatable-merge-strings", opts);
 
-    const obj1 = addObject(b, opts, .{ .name = "a", .asm_source_bytes = 
+    const obj1 = addObject(b, opts, .{ .name = "a", .asm_source_bytes =
         \\.section .rodata.str1.1,"aMS",@progbits,1
         \\val1:
         \\.ascii "Hello \0"
@@ -3075,7 +3075,7 @@ fn testStrip(b: *Build, opts: Options) *Step {
 fn testThunks(b: *Build, opts: Options) *Step {
     const test_step = addTestStep(b, "thunks", opts);
 
-    const exe = addExecutable(b, opts, .{ .name = "main", .c_source_bytes = 
+    const exe = addExecutable(b, opts, .{ .name = "main", .c_source_bytes =
         \\void foo();
         \\__attribute__((section(".bar"))) void bar() {
         \\  return foo();