Remove `ast::pure_fn` and all concept of `pure` from the compiler

src/librustc/metadata/decoder.rs

@@ -100,10 +100,8 @@ enum Family {
     Const,                 // c
     Fn,                    // f
     UnsafeFn,              // u
-    PureFn,                // p
     StaticMethod,          // F
     UnsafeStaticMethod,    // U
-    PureStaticMethod,      // P
     ForeignFn,             // e
     Type,                  // y
     ForeignType,           // T
@@ -125,10 +123,8 @@ fn item_family(item: ebml::Doc) -> Family {
       'c' => Const,
       'f' => Fn,
       'u' => UnsafeFn,
-      'p' => PureFn,
       'F' => StaticMethod,
       'U' => UnsafeStaticMethod,
-      'P' => PureStaticMethod,
       'e' => ForeignFn,
       'y' => Type,
       'T' => ForeignType,
@@ -325,7 +321,6 @@ fn item_to_def_like(item: ebml::Doc, did: ast::def_id, cnum: ast::crate_num)
         Struct    => dl_def(ast::def_struct(did)),
         UnsafeFn  => dl_def(ast::def_fn(did, ast::unsafe_fn)),
         Fn        => dl_def(ast::def_fn(did, ast::impure_fn)),
-        PureFn    => dl_def(ast::def_fn(did, ast::pure_fn)),
         ForeignFn => dl_def(ast::def_fn(did, ast::extern_fn)),
         UnsafeStaticMethod => {
             let trait_did_opt = translated_parent_item_opt(cnum, item);
@@ -335,10 +330,6 @@ fn item_to_def_like(item: ebml::Doc, did: ast::def_id, cnum: ast::crate_num)
             let trait_did_opt = translated_parent_item_opt(cnum, item);
             dl_def(ast::def_static_method(did, trait_did_opt, ast::impure_fn))
         }
-        PureStaticMethod => {
-            let trait_did_opt = translated_parent_item_opt(cnum, item);
-            dl_def(ast::def_static_method(did, trait_did_opt, ast::pure_fn))
-        }
         Type | ForeignType => dl_def(ast::def_ty(did)),
         Mod => dl_def(ast::def_mod(did)),
         ForeignMod => dl_def(ast::def_foreign_mod(did)),
@@ -822,12 +813,11 @@ pub fn get_static_methods_if_impl(intr: @ident_interner,
         let impl_method_doc = lookup_item(impl_method_id.node, cdata.data);
         let family = item_family(impl_method_doc);
         match family {
-            StaticMethod | UnsafeStaticMethod | PureStaticMethod => {
+            StaticMethod | UnsafeStaticMethod => {
                 let purity;
                 match item_family(impl_method_doc) {
                     StaticMethod => purity = ast::impure_fn,
                     UnsafeStaticMethod => purity = ast::unsafe_fn,
-                    PureStaticMethod => purity = ast::pure_fn,
                     _ => fail!()
                 }
 
@@ -934,10 +924,8 @@ fn item_family_to_str(fam: Family) -> ~str {
       Const => ~"const",
       Fn => ~"fn",
       UnsafeFn => ~"unsafe fn",
-      PureFn => ~"pure fn",
       StaticMethod => ~"static method",
       UnsafeStaticMethod => ~"unsafe static method",
-      PureStaticMethod => ~"pure static method",
       ForeignFn => ~"foreign fn",
       Type => ~"type",
       ForeignType => ~"foreign type",

src/librustc/metadata/encoder.rs

@@ -753,7 +753,6 @@ fn encode_info_for_method(ecx: &EncodeContext,
 fn purity_fn_family(p: purity) -> char {
     match p {
       unsafe_fn => 'u',
-      pure_fn => 'p',
       impure_fn => 'f',
       extern_fn => 'e'
     }
@@ -762,7 +761,6 @@ fn purity_fn_family(p: purity) -> char {
 fn purity_static_method_family(p: purity) -> char {
     match p {
       unsafe_fn => 'U',
-      pure_fn => 'P',
       impure_fn => 'F',
       _ => fail!("extern fn can't be static")
     }

src/librustc/metadata/tydecode.rs

@@ -439,10 +439,9 @@ fn parse_hex(st: &mut PState) -> uint {
 fn parse_purity(c: char) -> purity {
     match c {
       'u' => unsafe_fn,
-      'p' => pure_fn,
       'i' => impure_fn,
       'c' => extern_fn,
-      _ => fail!("parse_purity: bad purity")
+      _ => fail!("parse_purity: bad purity %c", c)
     }
 }
 

src/librustc/metadata/tyencode.rs

@@ -347,7 +347,6 @@ fn enc_sigil(w: @io::Writer, sigil: Sigil) {
 
 fn enc_purity(w: @io::Writer, p: purity) {
     match p {
-      pure_fn => w.write_char('p'),
       impure_fn => w.write_char('i'),
       unsafe_fn => w.write_char('u'),
       extern_fn => w.write_char('c')

src/librustc/middle/trans/reflect.rs

@@ -398,7 +398,6 @@ pub fn ast_sigil_constant(sigil: ast::Sigil) -> uint {
 
 pub fn ast_purity_constant(purity: ast::purity) -> uint {
     match purity {
-        ast::pure_fn => 0u,
         ast::unsafe_fn => 1u,
         ast::impure_fn => 2u,
         ast::extern_fn => 3u

src/librustc/middle/ty.rs

@@ -1253,7 +1253,7 @@ pub fn mk_ctor_fn(cx: ctxt, input_tys: &[ty::t], output: ty::t) -> t {
     let input_args = input_tys.map(|t| *t);
     mk_bare_fn(cx,
                BareFnTy {
-                   purity: ast::pure_fn,
+                   purity: ast::impure_fn,
                    abis: AbiSet::Rust(),
                    sig: FnSig {
                     bound_lifetime_names: opt_vec::Empty,

src/librustc/middle/typeck/check/mod.rs

@@ -275,7 +275,7 @@ pub fn blank_fn_ctxt(ccx: @mut CrateCtxt,
         err_count_on_creation: ccx.tcx.sess.err_count(),
         ret_ty: rty,
         indirect_ret_ty: None,
-        ps: PurityState::function(ast::pure_fn, 0),
+        ps: PurityState::function(ast::impure_fn, 0),
         region_lb: region_bnd,
         in_scope_regions: @Nil,
         fn_kind: Vanilla,

src/librustc/middle/typeck/infer/glb.rs

@@ -23,7 +23,7 @@
 use middle::typeck::isr_alist;
 use syntax::ast;
 use syntax::ast::{Many, Once, extern_fn, impure_fn, m_const, m_imm, m_mutbl};
-use syntax::ast::{pure_fn, unsafe_fn};
+use syntax::ast::{unsafe_fn};
 use syntax::ast::{Onceness, purity};
 use syntax::abi::AbiSet;
 use syntax::codemap::span;
@@ -103,7 +103,6 @@ fn contratys(&self, a: ty::t, b: ty::t) -> cres<ty::t> {
 
     fn purities(&self, a: purity, b: purity) -> cres<purity> {
         match (a, b) {
-          (pure_fn, _) | (_, pure_fn) => Ok(pure_fn),
           (extern_fn, _) | (_, extern_fn) => Ok(extern_fn),
           (impure_fn, _) | (_, impure_fn) => Ok(impure_fn),
           (unsafe_fn, unsafe_fn) => Ok(unsafe_fn)

src/librustc/middle/typeck/infer/lub.rs

@@ -28,7 +28,7 @@
 use syntax::abi::AbiSet;
 use syntax::ast;
 use syntax::ast::{Many, Once, extern_fn, m_const, impure_fn};
-use syntax::ast::{pure_fn, unsafe_fn};
+use syntax::ast::{unsafe_fn};
 use syntax::ast::{Onceness, purity};
 use syntax::codemap::span;
 
@@ -92,8 +92,7 @@ fn purities(&self, a: purity, b: purity) -> cres<purity> {
         match (a, b) {
           (unsafe_fn, _) | (_, unsafe_fn) => Ok(unsafe_fn),
           (impure_fn, _) | (_, impure_fn) => Ok(impure_fn),
-          (extern_fn, _) | (_, extern_fn) => Ok(extern_fn),
-          (pure_fn, pure_fn) => Ok(pure_fn)
+          (extern_fn, extern_fn) => Ok(extern_fn),
         }
     }
 

src/libsyntax/ast.rs

@@ -845,7 +845,6 @@ pub struct fn_decl {
 
 #[deriving(Eq, Encodable, Decodable)]
 pub enum purity {
-    pure_fn, // declared with "pure fn"
     unsafe_fn, // declared with "unsafe fn"
     impure_fn, // declared with "fn"
     extern_fn, // declared with "extern fn"
@@ -856,7 +855,6 @@ fn to_str(&self) -> ~str {
         match *self {
             impure_fn => ~"impure",
             unsafe_fn => ~"unsafe",
-            pure_fn => ~"pure",
             extern_fn => ~"extern"
         }
     }

src/libsyntax/print/pprust.rs

@@ -2188,26 +2188,29 @@ pub fn print_fn_header_info(s: @ps,
     print_opt_sigil(s, opt_sigil);
 }
 
-pub fn opt_sigil_to_str(opt_p: Option<ast::Sigil>) -> ~str {
+pub fn opt_sigil_to_str(opt_p: Option<ast::Sigil>) -> &'static str {
     match opt_p {
-      None => ~"fn",
-      Some(p) => fmt!("fn%s", p.to_str())
+      None => "fn",
+      Some(p) => match p {
+          ast::BorrowedSigil => "fn&",
+          ast::OwnedSigil => "fn~",
+          ast::ManagedSigil => "fn@"
+      }
     }
 }
 
-pub fn purity_to_str(p: ast::purity) -> ~str {
+pub fn purity_to_str(p: ast::purity) -> &'static str {
     match p {
-      ast::impure_fn => ~"impure",
-      ast::unsafe_fn => ~"unsafe",
-      ast::pure_fn => ~"pure",
-      ast::extern_fn => ~"extern"
+      ast::impure_fn => "impure",
+      ast::unsafe_fn => "unsafe",
+      ast::extern_fn => "extern"
     }
 }
 
-pub fn onceness_to_str(o: ast::Onceness) -> ~str {
+pub fn onceness_to_str(o: ast::Onceness) -> &'static str {
     match o {
-        ast::Once => ~"once",
-        ast::Many => ~"many"
+        ast::Once => "once",
+        ast::Many => "many"
     }
 }