Bumps [syn](https://github.com/dtolnay/syn) from 2.0.104 to 2.0.106. <details> <summary>Release notes</summary> <p><em>Sourced from <a href="https://github.com/dtolnay/syn/releases">syn's releases</a>.</em></p> <blockquote> <h2>2.0.106</h2> <ul> <li>Replace <code>~const</code> syntax with <code>[const]</code> conditionally const syntax in trait bounds (<a href="https://github.com/dtolnay/syn/issues/1896">#1896</a>, <a href="https://github.com/rust-lang/rust/pull/139858">rust-lang/rust#139858</a>)</li> <li>Support conditionally const impl Trait types (<a href="https://github.com/dtolnay/syn/issues/1897">#1897</a>)</li> <li>Reject polarity modifier and lifetime binder used in the same trait bound (<a href="https://github.com/dtolnay/syn/issues/1899">#1899</a>, <a href="https://github.com/rust-lang/rust/pull/127054">rust-lang/rust#127054</a>)</li> <li>Parse const trait bounds with bound lifetimes (<a href="https://github.com/dtolnay/syn/issues/1902">#1902</a>)</li> <li>Parse bound lifetimes with lifetime bounds (<a href="https://github.com/dtolnay/syn/issues/1903">#1903</a>)</li> <li>Allow type parameters and const parameters in trait bounds and generic closures (<a href="https://github.com/dtolnay/syn/issues/1904">#1904</a>, <a href="https://github.com/dtolnay/syn/issues/1907">#1907</a>, <a href="https://github.com/dtolnay/syn/issues/1908">#1908</a>, <a href="https://github.com/dtolnay/syn/issues/1909">#1909</a>)</li> </ul> <h2>2.0.105</h2> <ul> <li>Disallow "negative" inherent impls like <code>impl !T {}</code> (<a href="https://github.com/dtolnay/syn/issues/1881">#1881</a>, <a href="https://github.com/rust-lang/rust/pull/144386">rust-lang/rust#144386</a>)</li> </ul> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/dtolnay/syn/commit/0e4bc64fe1e07a574b6f3133927a27991fd40c2e"><code>0e4bc64</code></a> Release 2.0.106</li> <li><a href="https://github.com/dtolnay/syn/commit/4fb776a12ef91007a8ae1776e6b90aebd1479e97"><code>4fb776a</code></a> Merge pull request <a href="https://github.com/dtolnay/syn/issues/1910">#1910</a> from dtolnay/traitboundissue</li> <li><a href="https://github.com/dtolnay/syn/commit/41b24a588bdf333ed938821ec17f092bb678e832"><code>41b24a5</code></a> Fix duplicated async trait bound issue</li> <li><a href="https://github.com/dtolnay/syn/commit/a64f024cf8cf6bdb8312fc1a708242b1a1fcd9c2"><code>a64f024</code></a> Merge pull request <a href="https://github.com/dtolnay/syn/issues/1909">#1909</a> from dtolnay/fortype</li> <li><a href="https://github.com/dtolnay/syn/commit/176099e8682fa5577e28f518f777cf92b417f976"><code>176099e</code></a> Parse type parameter introducer on closures</li> <li><a href="https://github.com/dtolnay/syn/commit/b790b39351721d2d95f30cde31f6fcb6143b4e31"><code>b790b39</code></a> Merge pull request <a href="https://github.com/dtolnay/syn/issues/1908">#1908</a> from dtolnay/genericvsqpath</li> <li><a href="https://github.com/dtolnay/syn/commit/96496390a37acd364045b88a9ff537a1d05bf240"><code>9649639</code></a> Synchronize generics-vs-qpath heuristic with rust parser</li> <li><a href="https://github.com/dtolnay/syn/commit/60de3318e02ca24b235a2f7c2303f1827584b46f"><code>60de331</code></a> Merge pull request <a href="https://github.com/dtolnay/syn/issues/1907">#1907</a> from dtolnay/forconst</li> <li><a href="https://github.com/dtolnay/syn/commit/2aac6d76076f78d29f19db97a4924ee105f9ef1e"><code>2aac6d7</code></a> Allow const parameters in for<></li> <li><a href="https://github.com/dtolnay/syn/commit/11934e536584c2eb6a8e6d8041f21b8a1bb9aec2"><code>11934e5</code></a> Merge pull request <a href="https://github.com/dtolnay/syn/issues/1905">#1905</a> from dtolnay/unsafestatic</li> <li>Additional commits viewable in <a href="https://github.com/dtolnay/syn/compare/2.0.104...2.0.106">compare view</a></li> </ul> </details> <br /> [![Dependabot compatibility 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