1

我正在尝试安装镜头包以与haskell一起使用。

$ haste-inst install lens

我收到以下错误：

Resolving dependencies...
cabal: Could not resolve dependencies:
trying: base-4.6.0.1/installed-4.6... (user goal)
trying: containers-0.4.1.0/installed- (user goal)
trying: lens-4.9.1 (user goal)
next goal: template-haskell (dependency of lens-4.9.1)
rejecting: template-haskell-2.10.0.0 (conflict:
base==4.6.0.1/installed-4.6..., template-haskell => base==4.8.*)
rejecting: template-haskell-2.9.0.0 (conflict: base==4.6.0.1/installed-4.6...,
template-haskell => base==4.7.*)
rejecting: template-haskell-2.8.0.0 (conflict: containers==0.4.1.0/installed-,
template-haskell => containers==0.5.*)
rejecting: template-haskell-2.7.0.0 (conflict: base==4.6.0.1/installed-4.6...,
template-haskell => base==4.5.*)
rejecting: template-haskell-2.6.0.0 (conflict: base==4.6.0.1/installed-4.6...,
template-haskell => base==4.4.*)
rejecting: template-haskell-2.5.0.0 (conflict: base==4.6.0.1/installed-4.6...,
template-haskell => base==4.3.*)
rejecting: template-haskell-2.4.0.1 (conflict: base==4.6.0.1/installed-4.6...,
template-haskell => base==4.2.*)
rejecting: template-haskell-2.4.0.0 (conflict: base==4.6.0.1/installed-4.6...,
template-haskell => base>=3 && <4.3)
rejecting: template-haskell-2.3.0.1, 2.3.0.0, 2.2.0.0 (conflict: lens =>
template-haskell>=2.4 && <2.11)
Backjump limit reached (change with --max-backjumps).

Note: when using a sandbox, all packages are required to have consistent
dependencies. Try reinstalling/unregistering the offending packages or
recreating the sandbox.

我认为沙盒“注意”具有误导性。沙盒是新的，base无论如何都不能存在于沙盒中。

什么决定了加速基地的版本？使用 cabal（对于 haskell）安装镜头效果很好：

cabal install lens

编辑：

到目前为止，lens-family作为替代品效果很好。

4

1 回答 1

1

Lens 依赖于 Template Haskell，不幸的是，Haste 目前不支持该模板。

目前为 Haste 实现 base 的方式使得 TH 支持变得棘手。但是，无论如何，GHC 7.10 支持都需要进行一些重大改组，因此 TH 支持可能会与 7.10 一起出现。

于 2015-04-24T05:44:41.170 回答