rename ParserState::{makeCurPos -> at}

most instances of this being used do not refer to the "current"
position, sometimes not even to one reasonably close by. it could also
be called `makePos` instead, but `at` seems clear in context.

(cherry picked from commit 835a6c7bcfd0b22acc16f31de5fc7bb650d52017)
Change-Id: I17cab8a6cc14cac5b64624431957bfcf04140809

src/libexpr/parser-state.hh

@@ -49,7 +49,7 @@ struct ParserState {
     Formals * validateFormals(Formals * formals, PosIdx pos = noPos, Symbol arg = {});
     Expr * stripIndentation(const PosIdx pos,
         std::vector<std::pair<PosIdx, std::variant<Expr *, StringToken>>> && es);
-    PosIdx makeCurPos(const ParserLocation & loc);
+    PosIdx at(const ParserLocation & loc);
 };
 
 inline void ParserState::dupAttr(const AttrPath & attrPath, const PosIdx pos, const PosIdx prevPos)
@@ -254,7 +254,7 @@ inline Expr * ParserState::stripIndentation(const PosIdx pos,
     return new ExprConcatStrings(pos, true, es2);
 }
 
-inline PosIdx ParserState::makeCurPos(const ParserLocation & loc)
+inline PosIdx ParserState::at(const ParserLocation & loc)
 {
     return state.positions.add(origin, loc.first_line, loc.first_column);
 }